21238213912 has 16 divisors (see below), whose sum is σ = 39874687200. Its totient is φ = 10604964000.

The previous prime is 21238213879. The next prime is 21238213921. The reversal of 21238213912 is 21931283212.

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, 1761487 + ... + 1773502.

It is an arithmetic number, because the mean of its divisors is an integer number (2492167950).

Almost surely, 2^21238213912 is an apocalyptic number.

It is an amenable number.

21238213912 is a deficient number, since it is larger than the sum of its proper divisors (18636473288).

21238213912 is a wasteful number, since it uses less digits than its factorization.

21238213912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3535746 (or 3535742 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The spelling of 21238213912 in words is "twenty-one billion, two hundred thirty-eight million, two hundred thirteen thousand, nine hundred twelve".