216454605220 has 48 divisors (see below), whose sum is σ = 536248839168. Its totient is φ = 71819038080.

The previous prime is 216454605209. The next prime is 216454605233. The reversal of 216454605220 is 22506454612.

It is a happy number.

It is a super-2 number, since 2×216454605220² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216454605220.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24932827 + ... + 24941506.

It is an arithmetic number, because the mean of its divisors is an integer number (11171850816).

Almost surely, 2^216454605220 is an apocalyptic number.

216454605220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216454605220 is an abundant number, since it is smaller than the sum of its proper divisors (319794233948).

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

216454605220 is a wasteful number, since it uses less digits than its factorization.

216454605220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49874380 (or 49874378 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 37.

The spelling of 216454605220 in words is "two hundred sixteen billion, four hundred fifty-four million, six hundred five thousand, two hundred twenty".