21013400432 has 20 divisors (see below), whose sum is σ = 40794420240. Its totient is φ = 10485808128.

The previous prime is 21013400407. The next prime is 21013400459. The reversal of 21013400432 is 23400431012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1297457 + ... + 1313552.

It is an arithmetic number, because the mean of its divisors is an integer number (2039721012).

Almost surely, 2^21013400432 is an apocalyptic number.

It is an amenable number.

21013400432 is a deficient number, since it is larger than the sum of its proper divisors (19781019808).

21013400432 is a wasteful number, since it uses less digits than its factorization.

21013400432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2611520 (or 2611514 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21013400432 its reverse (23400431012), we get a palindrome (44413831444).

The spelling of 21013400432 in words is "twenty-one billion, thirteen million, four hundred thousand, four hundred thirty-two".