21611131653056 has 84 divisors (see below), whose sum is σ = 47006028664920. Its totient is φ = 9776671833600.

The previous prime is 21611131653017. The next prime is 21611131653091. The reversal of 21611131653056 is 65035613111612.

It is a super-2 number, since 2×21611131653056² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30998030 + ... + 31687538.

Almost surely, 2^{21611131653056} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21611131653056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23503014332460).

21611131653056 is an abundant number, since it is smaller than the sum of its proper divisors (25394897011864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21611131653056 is an equidigital number, since it uses as much as digits as its factorization.

21611131653056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689954 (or 689733 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 41.

Adding to 21611131653056 its reverse (65035613111612), we get a palindrome (86646744764668).

The spelling of 21611131653056 in words is "twenty-one trillion, six hundred eleven billion, one hundred thirty-one million, six hundred fifty-three thousand, fifty-six".