21102112013 has 16 divisors (see below), whose sum is σ = 22550520960. Its totient is φ = 19698733824.

The previous prime is 21102112007. The next prime is 21102112039. The reversal of 21102112013 is 31021120112.

It is not a de Polignac number, because 21102112013 - 2⁸ = 21102111757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102112093) 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 15 ways as a sum of consecutive naturals, for example, 1266545 + ... + 1283097.

It is an arithmetic number, because the mean of its divisors is an integer number (1409407560).

Almost surely, 2^21102112013 is an apocalyptic number.

21102112013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21102112013 is a deficient number, since it is larger than the sum of its proper divisors (1448408947).

21102112013 is a wasteful number, since it uses less digits than its factorization.

21102112013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17908.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21102112013 its reverse (31021120112), we get a palindrome (52123232125).

The spelling of 21102112013 in words is "twenty-one billion, one hundred two million, one hundred twelve thousand, thirteen".