212438566 has 4 divisors (see below), whose sum is σ = 318657852. Its totient is φ = 106219282.

The previous prime is 212438509. The next prime is 212438591. The reversal of 212438566 is 665834212.

It is a semiprime because it is the product of two primes.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 53109640 + ... + 53109643.

It is an arithmetic number, because the mean of its divisors is an integer number (79664463).

Almost surely, 2^212438566 is an apocalyptic number.

212438566 is a deficient number, since it is larger than the sum of its proper divisors (106219286).

212438566 is a wasteful number, since it uses less digits than its factorization.

212438566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106219285.

The product of its digits is 69120, while the sum is 37.

The square root of 212438566 is about 14575.2724159791. The cubic root of 212438566 is about 596.6840841886.

The spelling of 212438566 in words is "two hundred twelve million, four hundred thirty-eight thousand, five hundred sixty-six".