21535202712 has 32 divisors (see below), whose sum is σ = 54641563200. Its totient is φ = 7071260064.

The previous prime is 21535202639. The next prime is 21535202719. The reversal of 21535202712 is 21720253512.

It is a self number, because there is not a number n which added to its sum of digits gives 21535202712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21535202719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6694662 + ... + 6697877.

It is an arithmetic number, because the mean of its divisors is an integer number (1707548850).

Almost surely, 2^21535202712 is an apocalyptic number.

It is an amenable number.

21535202712 is an abundant number, since it is smaller than the sum of its proper divisors (33106360488).

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

21535202712 is a wasteful number, since it uses less digits than its factorization.

21535202712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13392615 (or 13392611 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The spelling of 21535202712 in words is "twenty-one billion, five hundred thirty-five million, two hundred two thousand, seven hundred twelve".