21452577317920 has 96 divisors (see below), whose sum is σ = 59334689586816. Its totient is φ = 7175774976000.

The previous prime is 21452577317917. The next prime is 21452577317959. The reversal of 21452577317920 is 2971377525412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 233540506 + ... + 233632345.

It is an arithmetic number, because the mean of its divisors is an integer number (618069683196).

Almost surely, 2^{21452577317920} is an apocalyptic number.

21452577317920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21452577317920 is an abundant number, since it is smaller than the sum of its proper divisors (37882112268896).

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

21452577317920 is a wasteful number, since it uses less digits than its factorization.

21452577317920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467172914 (or 467172906 counting only the distinct ones).

The product of its (nonzero) digits is 7408800, while the sum is 55.

The spelling of 21452577317920 in words is "twenty-one trillion, four hundred fifty-two billion, five hundred seventy-seven million, three hundred seventeen thousand, nine hundred twenty".