216451252 has 24 divisors (see below), whose sum is σ = 397901952. Its totient is φ = 102828000.

The previous prime is 216451243. The next prime is 216451253. The reversal of 216451252 is 252154612.

216451252 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×216451252² = 93702288984735008, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216451252.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216451253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6102 + ... + 21682.

It is an arithmetic number, because the mean of its divisors is an integer number (16579248).

Almost surely, 2^216451252 is an apocalyptic number.

It is an amenable number.

216451252 is a deficient number, since it is larger than the sum of its proper divisors (181450700).

216451252 is a wasteful number, since it uses less digits than its factorization.

216451252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15759 (or 15757 counting only the distinct ones).

The product of its digits is 4800, while the sum is 28.

The square root of 216451252 is about 14712.2823518311. The cubic root of 216451252 is about 600.4175352990.

The spelling of 216451252 in words is "two hundred sixteen million, four hundred fifty-one thousand, two hundred fifty-two".