21113430312 has 64 divisors (see below), whose sum is σ = 56860776000. Its totient is φ = 6494505984.

The previous prime is 21113430271. The next prime is 21113430319. The reversal of 21113430312 is 21303431112.

It is not an unprimeable number, because it can be changed into a prime (21113430319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1320864 + ... + 1336752.

It is an arithmetic number, because the mean of its divisors is an integer number (888449625).

Almost surely, 2^21113430312 is an apocalyptic number.

It is an amenable number.

21113430312 is an abundant number, since it is smaller than the sum of its proper divisors (35747345688).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21113430312 is a wasteful number, since it uses less digits than its factorization.

21113430312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20170 (or 20166 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21113430312 its reverse (21303431112), we get a palindrome (42416861424).

The spelling of 21113430312 in words is "twenty-one billion, one hundred thirteen million, four hundred thirty thousand, three hundred twelve".