21134216782568 has 32 divisors (see below), whose sum is σ = 41957893044360. Its totient is φ = 9945452912640.

The previous prime is 21134216782537. The next prime is 21134216782669. The reversal of 21134216782568 is 86528761243112.

It can be written as a sum of positive squares in 4 ways, for example, as 17535843006724 + 3598373775844 = 4187582^2 + 1896938^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28132280 + ... + 28873752.

Almost surely, 2^{21134216782568} is an apocalyptic number.

It is an amenable number.

21134216782568 is a deficient number, since it is larger than the sum of its proper divisors (20823676261792).

21134216782568 is a wasteful number, since it uses less digits than its factorization.

21134216782568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951077 (or 951073 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 56.

The spelling of 21134216782568 in words is "twenty-one trillion, one hundred thirty-four billion, two hundred sixteen million, seven hundred eighty-two thousand, five hundred sixty-eight".