21423537826872 has 32 divisors (see below), whose sum is σ = 53564282052480. Its totient is φ = 7140454277600.

The previous prime is 21423537826843. The next prime is 21423537826883. The reversal of 21423537826872 is 27862873532412.

It is a happy number.

It is a hoax number, since the sum of its digits (60) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45071028 + ... + 45543875.

It is an arithmetic number, because the mean of its divisors is an integer number (1673883814140).

Almost surely, 2^{21423537826872} is an apocalyptic number.

It is an amenable number.

21423537826872 is an abundant number, since it is smaller than the sum of its proper divisors (32140744225608).

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

21423537826872 is a wasteful number, since it uses less digits than its factorization.

21423537826872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90624763 (or 90624759 counting only the distinct ones).

The product of its digits is 54190080, while the sum is 60.

The spelling of 21423537826872 in words is "twenty-one trillion, four hundred twenty-three billion, five hundred thirty-seven million, eight hundred twenty-six thousand, eight hundred seventy-two".