21653743173356 has 24 divisors (see below), whose sum is σ = 43307623376640. Its totient is φ = 9280146282192.

The previous prime is 21653743173353. The next prime is 21653743173443. The reversal of 21653743173356 is 65337134735612.

It is not an unprimeable number, because it can be changed into a prime (21653743173353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9403001 + ... + 11477103.

It is an arithmetic number, because the mean of its divisors is an integer number (1804484307360).

Almost surely, 2^{21653743173356} is an apocalyptic number.

It is an amenable number.

21653743173356 is an abundant number, since it is smaller than the sum of its proper divisors (21653880203284).

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

21653743173356 is a wasteful number, since it uses less digits than its factorization.

21653743173356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2446973 (or 2446971 counting only the distinct ones).

The product of its digits is 28576800, while the sum is 56.

The spelling of 21653743173356 in words is "twenty-one trillion, six hundred fifty-three billion, seven hundred forty-three million, one hundred seventy-three thousand, three hundred fifty-six".