21365633054776 has 64 divisors (see below), whose sum is σ = 41204408827680. Its totient is φ = 10379922309120.

The previous prime is 21365633054771. The next prime is 21365633054789. The reversal of 21365633054776 is 67745033656312.

It is a self number, because there is not a number n which added to its sum of digits gives 21365633054776.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21365633054771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 583057111 + ... + 583093753.

Almost surely, 2^{21365633054776} is an apocalyptic number.

It is an amenable number.

21365633054776 is a deficient number, since it is larger than the sum of its proper divisors (19838775772904).

21365633054776 is a wasteful number, since it uses less digits than its factorization.

21365633054776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43864 (or 43860 counting only the distinct ones).

The product of its (nonzero) digits is 57153600, while the sum is 58.

The spelling of 21365633054776 in words is "twenty-one trillion, three hundred sixty-five billion, six hundred thirty-three million, fifty-four thousand, seven hundred seventy-six".