21765930045 has 32 divisors (see below), whose sum is σ = 35390545920. Its totient is φ = 11420834880.

The previous prime is 21765930041. The next prime is 21765930061. The reversal of 21765930045 is 54003956712.

It is not a de Polignac number, because 21765930045 - 2² = 21765930041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21765929979 and 21765930006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21765930041) 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, 488802 + ... + 531468.

It is an arithmetic number, because the mean of its divisors is an integer number (1105954560).

Almost surely, 2^21765930045 is an apocalyptic number.

It is an amenable number.

21765930045 is a deficient number, since it is larger than the sum of its proper divisors (13624615875).

21765930045 is a wasteful number, since it uses less digits than its factorization.

21765930045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43225.

The product of its (nonzero) digits is 226800, while the sum is 42.

The spelling of 21765930045 in words is "twenty-one billion, seven hundred sixty-five million, nine hundred thirty thousand, forty-five".