21753570155440 has 40 divisors (see below), whose sum is σ = 51810637219488. Its totient is φ = 8489198108160.

The previous prime is 21753570155419. The next prime is 21753570155477. The reversal of 21753570155440 is 4455107535712.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3316089732 + ... + 3316096291.

Almost surely, 2^{21753570155440} is an apocalyptic number.

21753570155440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21753570155440 is an abundant number, since it is smaller than the sum of its proper divisors (30057067064048).

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

21753570155440 is a wasteful number, since it uses less digits than its factorization.

21753570155440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6632186077 (or 6632186071 counting only the distinct ones).

The product of its (nonzero) digits is 2940000, while the sum is 49.

The spelling of 21753570155440 in words is "twenty-one trillion, seven hundred fifty-three billion, five hundred seventy million, one hundred fifty-five thousand, four hundred forty".