21655416002231 has 16 divisors (see below), whose sum is σ = 23804914003200. Its totient is φ = 19536061459200.

The previous prime is 21655416002173. The next prime is 21655416002237. The reversal of 21655416002231 is 13220061455612.

It is not a de Polignac number, because 21655416002231 - 2²² = 21655411807927 is a prime.

It is a super-2 number, since 2×21655416002231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21655416002237) 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 15 ways as a sum of consecutive naturals, for example, 87660935 + ... + 87907623.

It is an arithmetic number, because the mean of its divisors is an integer number (1487807125200).

Almost surely, 2^{21655416002231} is an apocalyptic number.

21655416002231 is a deficient number, since it is larger than the sum of its proper divisors (2149498000969).

21655416002231 is a wasteful number, since it uses less digits than its factorization.

21655416002231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307750.

The product of its (nonzero) digits is 86400, while the sum is 38.

Adding to 21655416002231 its reverse (13220061455612), we get a palindrome (34875477457843).

The spelling of 21655416002231 in words is "twenty-one trillion, six hundred fifty-five billion, four hundred sixteen million, two thousand, two hundred thirty-one".