211257172 has 12 divisors (see below), whose sum is σ = 422514400. Its totient is φ = 90538776.

The previous prime is 211257131. The next prime is 211257187. The reversal of 211257172 is 271752112.

211257172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

211257172 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 7544899 = 211257172 / (2 + 1 + 1 + 2 + 5 + 7 + 1 + 7 + 2).

It is a self number, because there is not a number n which added to its sum of digits gives 211257172.

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, 3772422 + ... + 3772477.

Almost surely, 2^211257172 is an apocalyptic number.

It is an amenable number.

211257172 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

211257172 is a wasteful number, since it uses less digits than its factorization.

211257172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7544910 (or 7544908 counting only the distinct ones).

The product of its digits is 1960, while the sum is 28.

The square root of 211257172 is about 14534.6885759551. The cubic root of 211257172 is about 595.5759524389.

The spelling of 211257172 in words is "two hundred eleven million, two hundred fifty-seven thousand, one hundred seventy-two".