21723706445 has 16 divisors (see below), whose sum is σ = 31545013248. Its totient is φ = 14020005120.

The previous prime is 21723706307. The next prime is 21723706507. The reversal of 21723706445 is 54460732712.

It is not a de Polignac number, because 21723706445 - 2¹⁴ = 21723690061 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18254621 + ... + 18255810.

It is an arithmetic number, because the mean of its divisors is an integer number (1971563328).

Almost surely, 2^21723706445 is an apocalyptic number.

It is an amenable number.

21723706445 is a deficient number, since it is larger than the sum of its proper divisors (9821306803).

21723706445 is a wasteful number, since it uses less digits than its factorization.

21723706445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36510460.

The product of its (nonzero) digits is 282240, while the sum is 41.

The spelling of 21723706445 in words is "twenty-one billion, seven hundred twenty-three million, seven hundred six thousand, four hundred forty-five".