21256852060 has 12 divisors (see below), whose sum is σ = 44639389368. Its totient is φ = 8502740816.

The previous prime is 21256852039. The next prime is 21256852061. The reversal of 21256852060 is 6025865212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21256852061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 531421282 + ... + 531421321.

It is an arithmetic number, because the mean of its divisors is an integer number (3719949114).

Almost surely, 2^21256852060 is an apocalyptic number.

21256852060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21256852060 is an abundant number, since it is smaller than the sum of its proper divisors (23382537308).

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

21256852060 is a wasteful number, since it uses less digits than its factorization.

21256852060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062842612 (or 1062842610 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

It can be divided in two parts, 212568 and 52060, that added together give a triangular number (264628 = T₇₂₇).

The spelling of 21256852060 in words is "twenty-one billion, two hundred fifty-six million, eight hundred fifty-two thousand, sixty".