21269207952 has 30 divisors (see below), whose sum is σ = 59524242102. Its totient is φ = 7089735936.

The previous prime is 21269207923. The next prime is 21269207959. The reversal of 21269207952 is 25970296212.

It can be written as a sum of positive squares in only one way, i.e., 13248930816 + 8020277136 = 115104^2 + 89556^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21269207898 and 21269207907.

It is not an unprimeable number, because it can be changed into a prime (21269207959) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73851273 + ... + 73851560.

Almost surely, 2^21269207952 is an apocalyptic number.

It is an amenable number.

21269207952 is an abundant number, since it is smaller than the sum of its proper divisors (38255034150).

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

21269207952 is a wasteful number, since it uses less digits than its factorization.

21269207952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147702847 (or 147702838 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The spelling of 21269207952 in words is "twenty-one billion, two hundred sixty-nine million, two hundred seven thousand, nine hundred fifty-two".