212157938 has 4 divisors (see below), whose sum is σ = 318236910. Its totient is φ = 106078968.

The previous prime is 212157937. The next prime is 212157983. The reversal of 212157938 is 839751212.

212157938 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 only one way, i.e., 211324369 + 833569 = 14537^2 + 913^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (212157931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53039483 + ... + 53039486.

Almost surely, 2^212157938 is an apocalyptic number.

212157938 is a deficient number, since it is larger than the sum of its proper divisors (106078972).

212157938 is a wasteful number, since it uses less digits than its factorization.

212157938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106078971.

The product of its digits is 30240, while the sum is 38.

The square root of 212157938 is about 14565.6423819892. The cubic root of 212157938 is about 596.4212316539.

The spelling of 212157938 in words is "two hundred twelve million, one hundred fifty-seven thousand, nine hundred thirty-eight".