212185664 has 14 divisors (see below), whose sum is σ = 421056054. Its totient is φ = 106092800.

The previous prime is 212185651. The next prime is 212185667. The reversal of 212185664 is 466581212.

It can be written as a sum of positive squares in only one way, i.e., 134745664 + 77440000 = 11608^2 + 8800^2 .

It is not an unprimeable number, because it can be changed into a prime (212185667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1657637 + ... + 1657764.

Almost surely, 2^212185664 is an apocalyptic number.

It is an amenable number.

212185664 is a deficient number, since it is larger than the sum of its proper divisors (208870390).

212185664 is an equidigital number, since it uses as much as digits as its factorization.

212185664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3315413 (or 3315403 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 212185664 is about 14566.5941111847. The cubic root of 212185664 is about 596.4472117561.

The spelling of 212185664 in words is "two hundred twelve million, one hundred eighty-five thousand, six hundred sixty-four".