213181312 has 16 divisors (see below), whose sum is σ = 424697400. Its totient is φ = 106590592.

The previous prime is 213181307. The next prime is 213181361.

It is a happy number.

213181312 is nontrivially palindromic in base 10.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832612 + ... + 832867.

Almost surely, 2^213181312 is an apocalyptic number.

It is an amenable number.

213181312 is a deficient number, since it is larger than the sum of its proper divisors (211516088).

213181312 is an equidigital number, since it uses as much as digits as its factorization.

213181312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665493 (or 1665481 counting only the distinct ones).

The product of its digits is 288, while the sum is 22.

The square root of 213181312 is about 14600.7298447715. The cubic root of 213181312 is about 597.3786680799.

The spelling of 213181312 in words is "two hundred thirteen million, one hundred eighty-one thousand, three hundred twelve".