21235462572 has 12 divisors (see below), whose sum is σ = 49549412696. Its totient is φ = 7078487520.

The previous prime is 21235462561. The next prime is 21235462627. The reversal of 21235462572 is 27526453212.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 21235462572.

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, 884810929 + ... + 884810952.

Almost surely, 2^21235462572 is an apocalyptic number.

It is an amenable number.

21235462572 is an abundant number, since it is smaller than the sum of its proper divisors (28313950124).

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

21235462572 is a wasteful number, since it uses less digits than its factorization.

21235462572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769621888 (or 1769621886 counting only the distinct ones).

The product of its digits is 201600, while the sum is 39.

The spelling of 21235462572 in words is "twenty-one billion, two hundred thirty-five million, four hundred sixty-two thousand, five hundred seventy-two".