21130043412 has 24 divisors (see below), whose sum is σ = 51898352800. Its totient is φ = 6672645216.

The previous prime is 21130043401. The next prime is 21130043447. The reversal of 21130043412 is 21434003112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46337587 + ... + 46338042.

Almost surely, 2^21130043412 is an apocalyptic number.

It is an amenable number.

21130043412 is an abundant number, since it is smaller than the sum of its proper divisors (30768309388).

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

21130043412 is a wasteful number, since it uses less digits than its factorization.

21130043412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92675655 (or 92675653 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21130043412 its reverse (21434003112), we get a palindrome (42564046524).

The spelling of 21130043412 in words is "twenty-one billion, one hundred thirty million, forty-three thousand, four hundred twelve".