21238774432 has 12 divisors (see below), whose sum is σ = 41813837226. Its totient is φ = 10619387200.

The previous prime is 21238774423. The next prime is 21238774439. The reversal of 21238774432 is 23447783212.

It can be written as a sum of positive squares in only one way, i.e., 16701943696 + 4536830736 = 129236^2 + 67356^2 .

It is not an unprimeable number, because it can be changed into a prime (21238774439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331855819 + ... + 331855882.

Almost surely, 2^21238774432 is an apocalyptic number.

It is an amenable number.

21238774432 is a deficient number, since it is larger than the sum of its proper divisors (20575062794).

21238774432 is an equidigital number, since it uses as much as digits as its factorization.

21238774432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663711711 (or 663711703 counting only the distinct ones).

The product of its digits is 451584, while the sum is 43.

The spelling of 21238774432 in words is "twenty-one billion, two hundred thirty-eight million, seven hundred seventy-four thousand, four hundred thirty-two".