21723757654 has 12 divisors (see below), whose sum is σ = 34390936044. Its totient is φ = 10290200652.

The previous prime is 21723757637. The next prime is 21723757667. The reversal of 21723757654 is 45675732712.

It is a junction number, because it is equal to n+sod(n) for n = 21723757598 and 21723757607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15043432 + ... + 15044875.

It is an arithmetic number, because the mean of its divisors is an integer number (2865911337).

Almost surely, 2^21723757654 is an apocalyptic number.

21723757654 is a deficient number, since it is larger than the sum of its proper divisors (12667178390).

21723757654 is a wasteful number, since it uses less digits than its factorization.

21723757654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30088347 (or 30088328 counting only the distinct ones).

The product of its digits is 2469600, while the sum is 49.

The spelling of 21723757654 in words is "twenty-one billion, seven hundred twenty-three million, seven hundred fifty-seven thousand, six hundred fifty-four".