21625706575 has 24 divisors (see below), whose sum is σ = 29263524336. Its totient is φ = 15722496000.

The previous prime is 21625706573. The next prime is 21625706617. The reversal of 21625706575 is 57560752612.

It is not a de Polignac number, because 21625706575 - 2¹ = 21625706573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21625706573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 927055 + ... + 950095.

It is an arithmetic number, because the mean of its divisors is an integer number (1219313514).

Almost surely, 2^21625706575 is an apocalyptic number.

21625706575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21625706575 is a deficient number, since it is larger than the sum of its proper divisors (7637817761).

21625706575 is a wasteful number, since it uses less digits than its factorization.

21625706575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26475 (or 26470 counting only the distinct ones).

The product of its (nonzero) digits is 882000, while the sum is 46.

The spelling of 21625706575 in words is "twenty-one billion, six hundred twenty-five million, seven hundred six thousand, five hundred seventy-five".