21663536152355 has 32 divisors (see below), whose sum is σ = 26387376998400. Its totient is φ = 17072212924800.

The previous prime is 21663536152337. The next prime is 21663536152397. The reversal of 21663536152355 is 55325163536612.

It is not a de Polignac number, because 21663536152355 - 2³⁸ = 21388658245411 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21663536152297 and 21663536152306.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64594550 + ... + 64929060.

It is an arithmetic number, because the mean of its divisors is an integer number (824605531200).

Almost surely, 2^{21663536152355} is an apocalyptic number.

21663536152355 is a deficient number, since it is larger than the sum of its proper divisors (4723840846045).

21663536152355 is a wasteful number, since it uses less digits than its factorization.

21663536152355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335315.

The product of its digits is 14580000, while the sum is 53.

Adding to 21663536152355 its reverse (55325163536612), we get a palindrome (76988699688967).

The spelling of 21663536152355 in words is "twenty-one trillion, six hundred sixty-three billion, five hundred thirty-six million, one hundred fifty-two thousand, three hundred fifty-five".