212155912 has 8 divisors (see below), whose sum is σ = 397792350. Its totient is φ = 106077952.

The previous prime is 212155901. The next prime is 212155939. The reversal of 212155912 is 219551212.

It can be written as a sum of positive squares in only one way, i.e., 157602916 + 54552996 = 12554^2 + 7386^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13259737 + ... + 13259752.

Almost surely, 2^212155912 is an apocalyptic number.

It is an amenable number.

212155912 is a deficient number, since it is larger than the sum of its proper divisors (185636438).

212155912 is a wasteful number, since it uses less digits than its factorization.

212155912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26519495 (or 26519491 counting only the distinct ones).

The product of its digits is 1800, while the sum is 28.

The square root of 212155912 is about 14565.5728345987. The cubic root of 212155912 is about 596.4193331417.

The spelling of 212155912 in words is "two hundred twelve million, one hundred fifty-five thousand, nine hundred twelve".