212123108 has 24 divisors (see below), whose sum is σ = 382501560. Its totient is φ = 102885120.

The previous prime is 212123083. The next prime is 212123117. The reversal of 212123108 is 801321212.

It can be written as a sum of positive squares in 4 ways, for example, as 362404 + 211760704 = 602^2 + 14552^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 212123108.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11858 + ... + 23766.

It is an arithmetic number, because the mean of its divisors is an integer number (15937565).

Almost surely, 2^212123108 is an apocalyptic number.

It is an amenable number.

212123108 is a deficient number, since it is larger than the sum of its proper divisors (170378452).

212123108 is a wasteful number, since it uses less digits than its factorization.

212123108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12047 (or 12045 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 212123108 is about 14564.4467110838. The cubic root of 212123108 is about 596.3885916804.

The spelling of 212123108 in words is "two hundred twelve million, one hundred twenty-three thousand, one hundred eight".