212549966 has 4 divisors (see below), whose sum is σ = 318824952. Its totient is φ = 106274982.

The previous prime is 212549927. The next prime is 212549971. The reversal of 212549966 is 669945212.

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, 53137490 + ... + 53137493.

It is an arithmetic number, because the mean of its divisors is an integer number (79706238).

Almost surely, 2^212549966 is an apocalyptic number.

212549966 is a deficient number, since it is larger than the sum of its proper divisors (106274986).

212549966 is a wasteful number, since it uses less digits than its factorization.

212549966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106274985.

The product of its digits is 233280, while the sum is 44.

The square root of 212549966 is about 14579.0934560418. The cubic root of 212549966 is about 596.7883637345.

The spelling of 212549966 in words is "two hundred twelve million, five hundred forty-nine thousand, nine hundred sixty-six".