212122157 has 4 divisors (see below), whose sum is σ = 228439260. Its totient is φ = 195805056.

The previous prime is 212122129. The next prime is 212122177. The reversal of 212122157 is 751221212.

212122157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42237001 + 169885156 = 6499^2 + 13034^2 .

It is a cyclic number.

It is not a de Polignac number, because 212122157 - 2²⁶ = 145013293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212122177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8158532 + ... + 8158557.

It is an arithmetic number, because the mean of its divisors is an integer number (57109815).

Almost surely, 2^212122157 is an apocalyptic number.

It is an amenable number.

212122157 is a deficient number, since it is larger than the sum of its proper divisors (16317103).

212122157 is a wasteful number, since it uses less digits than its factorization.

212122157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16317102.

The product of its digits is 560, while the sum is 23.

The square root of 212122157 is about 14564.4140630511. The cubic root of 212122157 is about 596.3877004269.

Adding to 212122157 its reverse (751221212), we get a palindrome (963343369).

The spelling of 212122157 in words is "two hundred twelve million, one hundred twenty-two thousand, one hundred fifty-seven".