21655600043232 has 48 divisors (see below), whose sum is σ = 59837842229760. Its totient is φ = 6838610539392.

The previous prime is 21655600043219. The next prime is 21655600043239. The reversal of 21655600043232 is 23234000655612.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21655600043239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5936292048 + ... + 5936295695.

It is an arithmetic number, because the mean of its divisors is an integer number (1246621713120).

Almost surely, 2^{21655600043232} is an apocalyptic number.

It is an amenable number.

21655600043232 is an abundant number, since it is smaller than the sum of its proper divisors (38182242186528).

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

21655600043232 is a wasteful number, since it uses less digits than its factorization.

21655600043232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11872587775 (or 11872587767 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 39.

Adding to 21655600043232 its reverse (23234000655612), we get a palindrome (44889600698844).

The spelling of 21655600043232 in words is "twenty-one trillion, six hundred fifty-five billion, six hundred million, forty-three thousand, two hundred thirty-two".