21253213021632 has 56 divisors (see below), whose sum is σ = 56609858586000. Its totient is φ = 7036857993216.

The previous prime is 21253213021609. The next prime is 21253213021643. The reversal of 21253213021632 is 23612031235212.

It is a junction number, because it is equal to n+sod(n) for n = 21253213021593 and 21253213021602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 371427157 + ... + 371484372.

Almost surely, 2^{21253213021632} is an apocalyptic number.

It is an amenable number.

21253213021632 is an abundant number, since it is smaller than the sum of its proper divisors (35356645564368).

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

21253213021632 is a wasteful number, since it uses less digits than its factorization.

21253213021632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742911693 (or 742911683 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

Adding to 21253213021632 its reverse (23612031235212), we get a palindrome (44865244256844).

The spelling of 21253213021632 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred thirteen million, twenty-one thousand, six hundred thirty-two".