21401596959564 has 96 divisors (see below), whose sum is σ = 50816725747200. Its totient is φ = 7008776957952.

The previous prime is 21401596959551. The next prime is 21401596959571. The reversal of 21401596959564 is 46595969510412.

It is a junction number, because it is equal to n+sod(n) for n = 21401596959495 and 21401596959504.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 955545214 + ... + 955567610.

It is an arithmetic number, because the mean of its divisors is an integer number (529340893200).

Almost surely, 2^{21401596959564} is an apocalyptic number.

It is an amenable number.

21401596959564 is an abundant number, since it is smaller than the sum of its proper divisors (29415128787636).

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

21401596959564 is a wasteful number, since it uses less digits than its factorization.

21401596959564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25567 (or 25565 counting only the distinct ones).

The product of its (nonzero) digits is 104976000, while the sum is 66.

The spelling of 21401596959564 in words is "twenty-one trillion, four hundred one billion, five hundred ninety-six million, nine hundred fifty-nine thousand, five hundred sixty-four".