212168831 has 4 divisors (see below), whose sum is σ = 242478672. Its totient is φ = 181858992.

The previous prime is 212168807. The next prime is 212168849. The reversal of 212168831 is 138861212.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-212168831 is a prime.

It is a super-2 number, since 2×212168831² = 90031225695813122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212168861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15154910 + ... + 15154923.

It is an arithmetic number, because the mean of its divisors is an integer number (60619668).

Almost surely, 2^212168831 is an apocalyptic number.

212168831 is a deficient number, since it is larger than the sum of its proper divisors (30309841).

212168831 is an equidigital number, since it uses as much as digits as its factorization.

212168831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30309840.

The product of its digits is 4608, while the sum is 32.

The square root of 212168831 is about 14566.0163050849. The cubic root of 212168831 is about 596.4314389949.

The spelling of 212168831 in words is "two hundred twelve million, one hundred sixty-eight thousand, eight hundred thirty-one".