21055015622616 has 32 divisors (see below), whose sum is σ = 53180194104240. Its totient is φ = 6945984534528.

The previous prime is 21055015622533. The next prime is 21055015622617. The reversal of 21055015622616 is 61622651055012.

It is a super-2 number, since 2×21055015622616² (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 (21055015622617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4522123021 + ... + 4522127676.

Almost surely, 2^{21055015622616} is an apocalyptic number.

It is an amenable number.

21055015622616 is an abundant number, since it is smaller than the sum of its proper divisors (32125178481624).

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

21055015622616 is a wasteful number, since it uses less digits than its factorization.

21055015622616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9044250803 (or 9044250799 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 42.

Adding to 21055015622616 its reverse (61622651055012), we get a palindrome (82677666677628).

The spelling of 21055015622616 in words is "twenty-one trillion, fifty-five billion, fifteen million, six hundred twenty-two thousand, six hundred sixteen".