213031312 has 20 divisors (see below), whose sum is σ = 444498460. Its totient is φ = 98322048.

The previous prime is 213031309. The next prime is 213031333. The reversal of 213031312 is 213130312.

It can be written as a sum of positive squares in 2 ways, for example, as 39740416 + 173290896 = 6304^2 + 13164^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 511887 + ... + 512302.

It is an arithmetic number, because the mean of its divisors is an integer number (22224923).

Almost surely, 2^213031312 is an apocalyptic number.

It is an amenable number.

213031312 is an abundant number, since it is smaller than the sum of its proper divisors (231467148).

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

213031312 is a wasteful number, since it uses less digits than its factorization.

213031312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024210 (or 1024204 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 213031312 is about 14595.5922113493. The cubic root of 213031312 is about 597.2385247372.

Adding to 213031312 its reverse (213130312), we get a palindrome (426161624).

The spelling of 213031312 in words is "two hundred thirteen million, thirty-one thousand, three hundred twelve".