21552401445020 has 48 divisors (see below), whose sum is σ = 45378711453600. Its totient is φ = 8598362572800.

The previous prime is 21552401445019. The next prime is 21552401445023. The reversal of 21552401445020 is 2054410425512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21552401445023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64064411 + ... + 64399949.

It is an arithmetic number, because the mean of its divisors is an integer number (945389821950).

Almost surely, 2^{21552401445020} is an apocalyptic number.

21552401445020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21552401445020 is an abundant number, since it is smaller than the sum of its proper divisors (23826310008580).

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

21552401445020 is a wasteful number, since it uses less digits than its factorization.

21552401445020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343958 (or 343956 counting only the distinct ones).

The product of its (nonzero) digits is 64000, while the sum is 35.

The spelling of 21552401445020 in words is "twenty-one trillion, five hundred fifty-two billion, four hundred one million, four hundred forty-five thousand, twenty".