212993521402 has 4 divisors (see below), whose sum is σ = 319490282106. Its totient is φ = 106496760700.

The previous prime is 212993521387. The next prime is 212993521421. The reversal of 212993521402 is 204125399212.

It is a happy number.

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., 125366273041 + 87627248361 = 354071^2 + 296019^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53248380349 + ... + 53248380352.

Almost surely, 2^212993521402 is an apocalyptic number.

212993521402 is a deficient number, since it is larger than the sum of its proper divisors (106496760704).

212993521402 is a wasteful number, since it uses less digits than its factorization.

212993521402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106496760703.

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 212993521402 in words is "two hundred twelve billion, nine hundred ninety-three million, five hundred twenty-one thousand, four hundred two".