213161812 has 12 divisors (see below), whose sum is σ = 373255540. Its totient is φ = 106517376.

The previous prime is 213161801. The next prime is 213161831. The reversal of 213161812 is 218161312.

213161812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 148937616 + 64224196 = 12204^2 + 8014^2 .

It is a congruent number.

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, 7887 + ... + 22102.

Almost surely, 2^213161812 is an apocalyptic number.

It is an amenable number.

213161812 is a deficient number, since it is larger than the sum of its proper divisors (160093728).

213161812 is a wasteful number, since it uses less digits than its factorization.

213161812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31770 (or 31768 counting only the distinct ones).

The product of its digits is 576, while the sum is 25.

The square root of 213161812 is about 14600.0620546626. The cubic root of 213161812 is about 597.3604531637.

The spelling of 213161812 in words is "two hundred thirteen million, one hundred sixty-one thousand, eight hundred twelve".