213431218 has 128 divisors (see below), whose sum is σ = 469647360. Its totient is φ = 69984000.

The previous prime is 213431171. The next prime is 213431233. The reversal of 213431218 is 812134312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 213431192 and 213431201.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1179088 + ... + 1179268.

It is an arithmetic number, because the mean of its divisors is an integer number (3669120).

Almost surely, 2^213431218 is an apocalyptic number.

213431218 is an abundant number, since it is smaller than the sum of its proper divisors (256216142).

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

213431218 is a wasteful number, since it uses less digits than its factorization.

213431218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264.

The product of its digits is 1152, while the sum is 25.

The square root of 213431218 is about 14609.2853350190. The cubic root of 213431218 is about 597.6120065693.

The spelling of 213431218 in words is "two hundred thirteen million, four hundred thirty-one thousand, two hundred eighteen".