21875205723 has 128 divisors (see below), whose sum is σ = 38335610880. Its totient is φ = 10807188480.

The previous prime is 21875205713. The next prime is 21875205727. The reversal of 21875205723 is 32750257812.

It is not a de Polignac number, because 21875205723 - 2¹² = 21875201627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21875205727) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 17683461 + ... + 17684697.

It is an arithmetic number, because the mean of its divisors is an integer number (299496960).

Almost surely, 2^21875205723 is an apocalyptic number.

21875205723 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21875205723 is a deficient number, since it is larger than the sum of its proper divisors (16460405157).

21875205723 is a wasteful number, since it uses less digits than its factorization.

21875205723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377.

The product of its (nonzero) digits is 235200, while the sum is 42.

The spelling of 21875205723 in words is "twenty-one billion, eight hundred seventy-five million, two hundred five thousand, seven hundred twenty-three".