21420573237480 has 64 divisors (see below), whose sum is σ = 64263097584000. Its totient is φ = 5712030385920.

The previous prime is 21420573237461. The next prime is 21420573237491. The reversal of 21420573237480 is 8473237502412.

21420573237480 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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 15 ways as a sum of consecutive naturals, for example, 3776421 + ... + 7556619.

It is an arithmetic number, because the mean of its divisors is an integer number (1004110899750).

Almost surely, 2^{21420573237480} is an apocalyptic number.

21420573237480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21420573237480 is an abundant number, since it is smaller than the sum of its proper divisors (42842524346520).

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

21420573237480 is a wasteful number, since it uses less digits than its factorization.

21420573237480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3827434 (or 3827430 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 48.

The spelling of 21420573237480 in words is "twenty-one trillion, four hundred twenty billion, five hundred seventy-three million, two hundred thirty-seven thousand, four hundred eighty".