212702794921 has 4 divisors (see below), whose sum is σ = 225214724052. Its totient is φ = 200190865792.

The previous prime is 212702794877. The next prime is 212702794949. The reversal of 212702794921 is 129497207212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 106169098896 + 106533696025 = 325836^2 + 326395^2 .

It is a cyclic number.

It is not a de Polignac number, because 212702794921 - 2²⁵ = 212669240489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212702794951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6255964540 + ... + 6255964573.

It is an arithmetic number, because the mean of its divisors is an integer number (56303681013).

Almost surely, 2^212702794921 is an apocalyptic number.

It is an amenable number.

212702794921 is a deficient number, since it is larger than the sum of its proper divisors (12511929131).

212702794921 is a wasteful number, since it uses less digits than its factorization.

212702794921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12511929130.

The product of its (nonzero) digits is 254016, while the sum is 46.

The spelling of 212702794921 in words is "two hundred twelve billion, seven hundred two million, seven hundred ninety-four thousand, nine hundred twenty-one".