212894989946 has 4 divisors (see below), whose sum is σ = 319342484922. Its totient is φ = 106447494972.

The previous prime is 212894989913. The next prime is 212894989969. The reversal of 212894989946 is 649989498212.

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

It can be written as a sum of positive squares in only one way, i.e., 178623724321 + 34271265625 = 422639^2 + 185125^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 212894989946.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53223747485 + ... + 53223747488.

Almost surely, 2^212894989946 is an apocalyptic number.

212894989946 is a deficient number, since it is larger than the sum of its proper divisors (106447494976).

212894989946 is a wasteful number, since it uses less digits than its factorization.

212894989946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106447494975.

The product of its digits is 161243136, while the sum is 71.

The spelling of 212894989946 in words is "two hundred twelve billion, eight hundred ninety-four million, nine hundred eighty-nine thousand, nine hundred forty-six".