212815970 has 16 divisors (see below), whose sum is σ = 383641920. Its totient is φ = 84999024.

The previous prime is 212815957. The next prime is 212816057. The reversal of 212815970 is 79518212.

It is a self number, because there is not a number n which added to its sum of digits gives 212815970.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8750 + ... + 22409.

It is an arithmetic number, because the mean of its divisors is an integer number (23977620).

Almost surely, 2^212815970 is an apocalyptic number.

212815970 is a deficient number, since it is larger than the sum of its proper divisors (170825950).

212815970 is a wasteful number, since it uses less digits than its factorization.

212815970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31849.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 212815970 is about 14588.2133930101. The cubic root of 212815970 is about 597.0372180268.

The spelling of 212815970 in words is "two hundred twelve million, eight hundred fifteen thousand, nine hundred seventy".