21605123023692 has 96 divisors (see below), whose sum is σ = 54408212006400. Its totient is φ = 6633245882880.

The previous prime is 21605123023681. The next prime is 21605123023699. The reversal of 21605123023692 is 29632032150612.

It is a super-2 number, since 2×21605123023692² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21605123023699) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 134406184 + ... + 134566832.

It is an arithmetic number, because the mean of its divisors is an integer number (566752208400).

Almost surely, 2^{21605123023692} is an apocalyptic number.

It is an amenable number.

21605123023692 is an abundant number, since it is smaller than the sum of its proper divisors (32803088982708).

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

21605123023692 is a wasteful number, since it uses less digits than its factorization.

21605123023692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162543 (or 162541 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 42.

The spelling of 21605123023692 in words is "twenty-one trillion, six hundred five billion, one hundred twenty-three million, twenty-three thousand, six hundred ninety-two".