21574499823 has 8 divisors (see below), whose sum is σ = 31962222000. Its totient is φ = 14382999864.

The previous prime is 21574499761. The next prime is 21574499857. The reversal of 21574499823 is 32899447512.

21574499823 is a `hidden beast` number, since 2 + 1 + 5 + 74 + 499 + 82 + 3 = 666.

It is not a de Polignac number, because 21574499823 - 2³⁰ = 20500757999 is a prime.

It is a super-2 number, since 2×21574499823² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21574499823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21574497823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 399527748 + ... + 399527801.

It is an arithmetic number, because the mean of its divisors is an integer number (3995277750).

Almost surely, 2^21574499823 is an apocalyptic number.

21574499823 is a deficient number, since it is larger than the sum of its proper divisors (10387722177).

21574499823 is an equidigital number, since it uses as much as digits as its factorization.

21574499823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799055558 (or 799055552 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The spelling of 21574499823 in words is "twenty-one billion, five hundred seventy-four million, four hundred ninety-nine thousand, eight hundred twenty-three".