21155025022263 has 24 divisors (see below), whose sum is σ = 34569827650176. Its totient is φ = 12821227284600.

The previous prime is 21155025022259. The next prime is 21155025022331. The reversal of 21155025022263 is 36222052055112.

21155025022263 is a `hidden beast` number, since 2 + 1 + 1 + 550 + 25 + 0 + 2 + 22 + 63 = 666.

It is not a de Polignac number, because 21155025022263 - 2² = 21155025022259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21155025027263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3957166243 + ... + 3957171588.

It is an arithmetic number, because the mean of its divisors is an integer number (1440409485424).

Almost surely, 2^{21155025022263} is an apocalyptic number.

21155025022263 is a deficient number, since it is larger than the sum of its proper divisors (13414802627913).

21155025022263 is an equidigital number, since it uses as much as digits as its factorization.

21155025022263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7914337857 (or 7914337845 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

Adding to 21155025022263 its reverse (36222052055112), we get a palindrome (57377077077375).

The spelling of 21155025022263 in words is "twenty-one trillion, one hundred fifty-five billion, twenty-five million, twenty-two thousand, two hundred sixty-three".