21752637845 has 8 divisors (see below), whose sum is σ = 26945203200. Its totient is φ = 16840751760.

The previous prime is 21752637833. The next prime is 21752637853. The reversal of 21752637845 is 54873625712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21752637845 - 2²⁰ = 21751589269 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21752637793 and 21752637802.

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, 70169645 + ... + 70169954.

It is an arithmetic number, because the mean of its divisors is an integer number (3368150400).

Almost surely, 2^21752637845 is an apocalyptic number.

It is an amenable number.

21752637845 is a deficient number, since it is larger than the sum of its proper divisors (5192565355).

21752637845 is a wasteful number, since it uses less digits than its factorization.

21752637845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140339635.

The product of its digits is 2822400, while the sum is 50.

The spelling of 21752637845 in words is "twenty-one billion, seven hundred fifty-two million, six hundred thirty-seven thousand, eight hundred forty-five".