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11111121021 = 37111319918593
BaseRepresentation
bin10100101100100011…
…00100000001111101
31001200100112102121210
422112101210001331
5140223421333041
65034313515033
7542225653560
oct122621440175
931610472553
1011111121021
114791a35750
1221a1112a79
131080c63030
147759584d7
154506de016
hex29646407d

11111121021 has 64 divisors (see below), whose sum is σ = 19992268800. Its totient is φ = 5300951040.

The previous prime is 11111121019. The next prime is 11111121031. The reversal of 11111121021 is 12012111111.

It is not a de Polignac number, because 11111121021 - 21 = 11111121019 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11111120988 and 11111121006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111121031) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 588301 + ... + 606893.

It is an arithmetic number, because the mean of its divisors is an integer number (312379200).

Almost surely, 211111121021 is an apocalyptic number.

11111121021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11111121021 is a deficient number, since it is larger than the sum of its proper divisors (8881147779).

11111121021 is a wasteful number, since it uses less digits than its factorization.

11111121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18826.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 11111121021 its reverse (12012111111), we get a palindrome (23123232132).

The spelling of 11111121021 in words is "eleven billion, one hundred eleven million, one hundred twenty-one thousand, twenty-one".

Divisors: 1 3 7 11 13 21 33 39 77 91 143 199 231 273 429 597 1001 1393 2189 2587 3003 4179 6567 7761 15323 18109 18593 28457 45969 54327 55779 85371 130151 199199 204523 241709 390453 597597 613569 725127 1431661 1691963 2658799 3700007 4294983 5075889 7976397 11100021 18611593 25900049 40700077 48100091 55834779 77700147 122100231 144300273 284900539 336700637 529101001 854701617 1010101911 1587303003 3703707007 11111121021