21897173375 has 48 divisors (see below), whose sum is σ = 34329142848. Its totient is φ = 13650120000.

The previous prime is 21897173369. The next prime is 21897173377. The reversal of 21897173375 is 57337179812.

It is not a de Polignac number, because 21897173375 - 2¹⁰ = 21897172351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21897173377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2465 + ... + 209285.

It is an arithmetic number, because the mean of its divisors is an integer number (715190476).

Almost surely, 2^21897173375 is an apocalyptic number.

21897173375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21897173375 is a deficient number, since it is larger than the sum of its proper divisors (12431969473).

21897173375 is a wasteful number, since it uses less digits than its factorization.

21897173375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206865 (or 206844 counting only the distinct ones).

The product of its digits is 2222640, while the sum is 53.

The spelling of 21897173375 in words is "twenty-one billion, eight hundred ninety-seven million, one hundred seventy-three thousand, three hundred seventy-five".