21616563335232 has 112 divisors (see below), whose sum is σ = 57778272161792. Its totient is φ = 7131960506880.

The previous prime is 21616563335219. The next prime is 21616563335243. The reversal of 21616563335232 is 23253336561612.

It is a happy number.

It is a super-2 number, since 2×21616563335232² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39019857 + ... + 39569967.

It is an arithmetic number, because the mean of its divisors is an integer number (515877430016).

Almost surely, 2^{21616563335232} 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 21616563335232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28889136080896).

21616563335232 is an abundant number, since it is smaller than the sum of its proper divisors (36161708826560).

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

21616563335232 is a wasteful number, since it uses less digits than its factorization.

21616563335232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552216 (or 552206 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 48.

Adding to 21616563335232 its reverse (23253336561612), we get a palindrome (44869899896844).

The spelling of 21616563335232 in words is "twenty-one trillion, six hundred sixteen billion, five hundred sixty-three million, three hundred thirty-five thousand, two hundred thirty-two".