21213612523260 has 72 divisors (see below), whose sum is σ = 64839163845456. Its totient is φ = 5613780407040.

The previous prime is 21213612523253. The next prime is 21213612523261. The reversal of 21213612523260 is 6232521631212.

21213612523260 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 3 + 612 + 5 + 2 + 32 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213612523261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 449798569 + ... + 449845728.

It is an arithmetic number, because the mean of its divisors is an integer number (900543942298).

Almost surely, 2^{21213612523260} is an apocalyptic number.

21213612523260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21213612523260 is an abundant number, since it is smaller than the sum of its proper divisors (43625551322196).

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

21213612523260 is a wasteful number, since it uses less digits than its factorization.

21213612523260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899644443 (or 899644438 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 21213612523260 in words is "twenty-one trillion, two hundred thirteen billion, six hundred twelve million, five hundred twenty-three thousand, two hundred sixty".