212155124 has 6 divisors (see below), whose sum is σ = 371271474. Its totient is φ = 106077560.

The previous prime is 212155123. The next prime is 212155183. The reversal of 212155124 is 421551212.

It can be written as a sum of positive squares in only one way, i.e., 203975524 + 8179600 = 14282^2 + 2860^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 212155124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212155123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26519387 + ... + 26519394.

It is an arithmetic number, because the mean of its divisors is an integer number (61878579).

Almost surely, 2^212155124 is an apocalyptic number.

It is an amenable number.

212155124 is a deficient number, since it is larger than the sum of its proper divisors (159116350).

212155124 is a wasteful number, since it uses less digits than its factorization.

212155124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53038785 (or 53038783 counting only the distinct ones).

The product of its digits is 800, while the sum is 23.

The square root of 212155124 is about 14565.5457844874. The cubic root of 212155124 is about 596.4185947241.

The spelling of 212155124 in words is "two hundred twelve million, one hundred fifty-five thousand, one hundred twenty-four".