221976512402 has 18 divisors (see below), whose sum is σ = 353721108447. Its totient is φ = 104454204864.

The previous prime is 221976512389. The next prime is 221976512411. The reversal of 221976512402 is 204215679122.

It can be written as a sum of positive squares in 5 ways, for example, as 149899834561 + 72076677841 = 387169^2 + 268471^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=333149.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221976512402.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 11317268 + ... + 11336864.

Almost surely, 2^221976512402 is an apocalyptic number.

221976512402 is a deficient number, since it is larger than the sum of its proper divisors (131744596045).

221976512402 is an frugal number, since it uses more digits than its factorization.

221976512402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39230 (or 19616 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 221976512402 in words is "two hundred twenty-one billion, nine hundred seventy-six million, five hundred twelve thousand, four hundred two".