21235427575 has 24 divisors (see below), whose sum is σ = 27369529488. Its totient is φ = 16329991680.

The previous prime is 21235427531. The next prime is 21235427581. The reversal of 21235427575 is 57572453212.

It is not a de Polignac number, because 21235427575 - 2²¹ = 21233330423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61522 + ... + 215071.

It is an arithmetic number, because the mean of its divisors is an integer number (1140397062).

Almost surely, 2^21235427575 is an apocalyptic number.

21235427575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21235427575 is a deficient number, since it is larger than the sum of its proper divisors (6134101913).

21235427575 is a wasteful number, since it uses less digits than its factorization.

21235427575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276723 (or 276718 counting only the distinct ones).

The product of its digits is 588000, while the sum is 43.

The spelling of 21235427575 in words is "twenty-one billion, two hundred thirty-five million, four hundred twenty-seven thousand, five hundred seventy-five".