21655556241600 has 84 divisors (see below), whose sum is σ = 71048270785064. Its totient is φ = 5774814996480.

The previous prime is 21655556241587. The next prime is 21655556241659. The reversal of 21655556241600 is 614265555612.

It is a super-2 number, since 2×21655556241600² (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 a self number, because there is not a number n which added to its sum of digits gives 21655556241600.

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, 2255782309 + ... + 2255791908.

Almost surely, 2^{21655556241600} is an apocalyptic number.

21655556241600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21655556241600 is an abundant number, since it is smaller than the sum of its proper divisors (49392714543464).

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

21655556241600 is a wasteful number, since it uses less digits than its factorization.

21655556241600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4511574242 (or 4511574227 counting only the distinct ones).

The product of its (nonzero) digits is 2160000, while the sum is 48.

The spelling of 21655556241600 in words is "twenty-one trillion, six hundred fifty-five billion, five hundred fifty-six million, two hundred forty-one thousand, six hundred".