21633633055365 has 16 divisors (see below), whose sum is σ = 34620977942016. Its totient is φ = 11535549278400.

The previous prime is 21633633055361. The next prime is 21633633055403. The reversal of 21633633055365 is 56355033633612.

It is not a de Polignac number, because 21633633055365 - 2² = 21633633055361 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21633633055361) 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, 149197066 + ... + 149341995.

It is an arithmetic number, because the mean of its divisors is an integer number (2163811121376).

Almost surely, 2^{21633633055365} is an apocalyptic number.

It is an amenable number.

21633633055365 is a deficient number, since it is larger than the sum of its proper divisors (12987344886651).

21633633055365 is a wasteful number, since it uses less digits than its factorization.

21633633055365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298543900.

The product of its (nonzero) digits is 13122000, while the sum is 51.

Adding to 21633633055365 its reverse (56355033633612), we get a palindrome (77988666688977).

The spelling of 21633633055365 in words is "twenty-one trillion, six hundred thirty-three billion, six hundred thirty-three million, fifty-five thousand, three hundred sixty-five".