212539966 has 16 divisors (see below), whose sum is σ = 335998800. Its totient is φ = 100554048.

The previous prime is 212539931. The next prime is 212539993. The reversal of 212539966 is 669935212.

It is a congruent number.

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, 33280 + ... + 39148.

It is an arithmetic number, because the mean of its divisors is an integer number (20999925).

Almost surely, 2^212539966 is an apocalyptic number.

212539966 is a deficient number, since it is larger than the sum of its proper divisors (123458834).

212539966 is a wasteful number, since it uses less digits than its factorization.

212539966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6843.

The product of its digits is 174960, while the sum is 43.

The square root of 212539966 is about 14578.7504951556. The cubic root of 212539966 is about 596.7790044023.

The spelling of 212539966 in words is "two hundred twelve million, five hundred thirty-nine thousand, nine hundred sixty-six".