21723891919604 has 48 divisors (see below), whose sum is σ = 45892332896256. Its totient is φ = 8800376306400.

The previous prime is 21723891919459. The next prime is 21723891919627. The reversal of 21723891919604 is 40691919832712.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 290980412 + ... + 291055059.

It is an arithmetic number, because the mean of its divisors is an integer number (956090268672).

Almost surely, 2^{21723891919604} is an apocalyptic number.

It is an amenable number.

21723891919604 is an abundant number, since it is smaller than the sum of its proper divisors (24168440976652).

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

21723891919604 is a wasteful number, since it uses less digits than its factorization.

21723891919604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582035556 (or 582035554 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 62.

The spelling of 21723891919604 in words is "twenty-one trillion, seven hundred twenty-three billion, eight hundred ninety-one million, nine hundred nineteen thousand, six hundred four".