216442052521020 has 144 divisors (see below), whose sum is σ = 678460865033952. Its totient is φ = 55817429875200.

The previous prime is 216442052520943. The next prime is 216442052521039. The reversal of 216442052521020 is 20125250244612.

216442052521020 is a `hidden beast` number, since 2 + 1 + 6 + 4 + 4 + 20 + 525 + 2 + 102 + 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 an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 137654347 + ... + 139217826.

It is an arithmetic number, because the mean of its divisors is an integer number (4711533784958).

Almost surely, 2^{216442052521020} is an apocalyptic number.

216442052521020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216442052521020 is an abundant number, since it is smaller than the sum of its proper divisors (462018812512932).

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

216442052521020 is a wasteful number, since it uses less digits than its factorization.

216442052521020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276872332 (or 276872327 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

The spelling of 216442052521020 in words is "two hundred sixteen trillion, four hundred forty-two billion, fifty-two million, five hundred twenty-one thousand, twenty".