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12121011 = 327421457
BaseRepresentation
bin101110001111…
…001110110011
3211210210220100
4232033032303
511100333021
61111443443
7205012140
oct56171663
924723810
1012121011
116929771
124086583
1326850c6
1418773c7
1510e6626
hexb8f3b3

12121011 has 24 divisors (see below), whose sum is σ = 20100704. Its totient is φ = 6894720.

The previous prime is 12121009. The next prime is 12121061. The reversal of 12121011 is 11012121.

It is a happy number.

12121011 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12121011 - 21 = 12121009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12120984 and 12121002.

It is not an unprimeable number, because it can be changed into a prime (12121061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26295 + ... + 26751.

Almost surely, 212121011 is an apocalyptic number.

12121011 is a deficient number, since it is larger than the sum of its proper divisors (7979693).

12121011 is a wasteful number, since it uses less digits than its factorization.

12121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891 (or 888 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 12121011 is about 3481.5242351591. The cubic root of 12121011 is about 229.7098483600.

Adding to 12121011 its reverse (11012121), we get a palindrome (23133132).

The spelling of 12121011 in words is "twelve million, one hundred twenty-one thousand, eleven".

Divisors: 1 3 7 9 21 63 421 457 1263 1371 2947 3199 3789 4113 8841 9597 26523 28791 192397 577191 1346779 1731573 4040337 12121011