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21011121113 = 281467316001
BaseRepresentation
bin10011100100010111…
…000100001111011001
32000020022010112122212
4103210113010033121
5321012321333423
613352525124505
71342450403603
oct234427041731
960208115585
1021011121113
118a02259304
1240a46b9735
131c9b009a58
1410346ca173
1582e8e7578
hex4e45c43d9

21011121113 has 8 divisors (see below), whose sum is σ = 21091724136. Its totient is φ = 20930560000.

The previous prime is 21011121073. The next prime is 21011121127. The reversal of 21011121113 is 31112111012.

It can be written as a sum of positive squares in 4 ways, for example, as 14225809984 + 6785311129 = 119272^2 + 82373^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-21011121113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011121013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1305113 + ... + 1321113.

It is an arithmetic number, because the mean of its divisors is an integer number (2636465517).

Almost surely, 221011121113 is an apocalyptic number.

It is an amenable number.

21011121113 is a deficient number, since it is larger than the sum of its proper divisors (80603023).

21011121113 is a wasteful number, since it uses less digits than its factorization.

21011121113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20955.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 21011121113 its reverse (31112111012), we get a palindrome (52123232125).

The spelling of 21011121113 in words is "twenty-one billion, eleven million, one hundred twenty-one thousand, one hundred thirteen".

Divisors: 1 281 4673 16001 1313113 4496281 74772673 21011121113