212157 has 12 divisors (see below), whose sum is σ = 334464. Its totient is φ = 128520.

The previous prime is 212141. The next prime is 212161. The reversal of 212157 is 751212.

It is not a de Polignac number, because 212157 - 2⁴ = 212141 is a prime.

It is a Smith number, since the sum of its digits (18) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212117) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 973 + ... + 1170.

It is an arithmetic number, because the mean of its divisors is an integer number (27872).

2²¹²¹⁵⁷ is an apocalyptic number.

It is an amenable number.

212157 is a deficient number, since it is larger than the sum of its proper divisors (122307).

212157 is a wasteful number, since it uses less digits than its factorization.

212157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2160 (or 2157 counting only the distinct ones).

The product of its digits is 140, while the sum is 18.

The square root of 212157 is about 460.6050368808. The cubic root of 212157 is about 59.6420352680.

Adding to 212157 its reverse (751212), we get a palindrome (963369).

The spelling of 212157 in words is "two hundred twelve thousand, one hundred fifty-seven".