21005780896053 has 32 divisors (see below), whose sum is σ = 31234845286400. Its totient is φ = 13952043991728.

The previous prime is 21005780896049. The next prime is 21005780896117. The reversal of 21005780896053 is 35069808750012.

21005780896053 is a `hidden beast` number, since 2 + 1 + 0 + 0 + 578 + 0 + 8 + 9 + 60 + 5 + 3 = 666.

It is not a de Polignac number, because 21005780896053 - 2² = 21005780896049 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21005780895053) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46223526 + ... + 46675752.

It is an arithmetic number, because the mean of its divisors is an integer number (976088915200).

Almost surely, 2^{21005780896053} is an apocalyptic number.

It is an amenable number.

21005780896053 is a deficient number, since it is larger than the sum of its proper divisors (10229064390347).

21005780896053 is a wasteful number, since it uses less digits than its factorization.

21005780896053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458598 (or 458592 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 54.

The spelling of 21005780896053 in words is "twenty-one trillion, five billion, seven hundred eighty million, eight hundred ninety-six thousand, fifty-three".