21723261375 has 64 divisors (see below), whose sum is σ = 38596985856. Its totient is φ = 10824105600.

The previous prime is 21723261359. The next prime is 21723261409. The reversal of 21723261375 is 57316232712.

It is not a de Polignac number, because 21723261375 - 2⁴ = 21723261359 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 341589 + ... + 400161.

It is an arithmetic number, because the mean of its divisors is an integer number (603077904).

Almost surely, 2^21723261375 is an apocalyptic number.

21723261375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21723261375 is a deficient number, since it is larger than the sum of its proper divisors (16873724481).

21723261375 is a wasteful number, since it uses less digits than its factorization.

21723261375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58657 (or 58647 counting only the distinct ones).

The product of its digits is 105840, while the sum is 39.

The spelling of 21723261375 in words is "twenty-one billion, seven hundred twenty-three million, two hundred sixty-one thousand, three hundred seventy-five".