21213556315562 has 16 divisors (see below), whose sum is σ = 34268155646760. Its totient is φ = 9790842677952.

The previous prime is 21213556315453. The next prime is 21213556315571. The reversal of 21213556315562 is 26551365531212.

It can be written as a sum of positive squares in 4 ways, for example, as 3367485575041 + 17846070740521 = 1835071^2 + 4224461^2 .

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 in 7 ways as a sum of consecutive naturals, for example, 9270764 + ... + 11330232.

Almost surely, 2^{21213556315562} is an apocalyptic number.

21213556315562 is a deficient number, since it is larger than the sum of its proper divisors (13054599331198).

21213556315562 is a wasteful number, since it uses less digits than its factorization.

21213556315562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2455657.

The product of its digits is 1620000, while the sum is 47.

The spelling of 21213556315562 in words is "twenty-one trillion, two hundred thirteen billion, five hundred fifty-six million, three hundred fifteen thousand, five hundred sixty-two".