21239004011220 has 144 divisors (see below), whose sum is σ = 69095310560640. Its totient is φ = 5264404524288.

The previous prime is 21239004011179. The next prime is 21239004011221. The reversal of 21239004011220 is 2211040093212.

21239004011220 is a `hidden beast` number, since 2 + 1 + 2 + 39 + 0 + 0 + 401 + 1 + 220 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21239004011221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58405864 + ... + 58768383.

It is an arithmetic number, because the mean of its divisors is an integer number (479828545560).

Almost surely, 2^{21239004011220} is an apocalyptic number.

21239004011220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21239004011220 is an abundant number, since it is smaller than the sum of its proper divisors (47856306549420).

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

21239004011220 is a wasteful number, since it uses less digits than its factorization.

21239004011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117174334 (or 117174329 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 21239004011220 in words is "twenty-one trillion, two hundred thirty-nine billion, four million, eleven thousand, two hundred twenty".