213047172 has 60 divisors (see below), whose sum is σ = 599801356. Its totient is φ = 65551680.

The previous prime is 213047167. The next prime is 213047231. The reversal of 213047172 is 271740312.

It is a happy number.

213047172 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 85266756 + 127780416 = 9234^2 + 11304^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 21079 + ... + 29502.

Almost surely, 2^213047172 is an apocalyptic number.

It is an amenable number.

213047172 is an abundant number, since it is smaller than the sum of its proper divisors (386754184).

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

213047172 is a wasteful number, since it uses less digits than its factorization.

213047172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50610 (or 50599 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 213047172 is about 14596.1355159508. The cubic root of 213047172 is about 597.2533456695.

Adding to 213047172 its reverse (271740312), we get a palindrome (484787484).

The spelling of 213047172 in words is "two hundred thirteen million, forty-seven thousand, one hundred seventy-two".