21524205023 has 16 divisors (see below), whose sum is σ = 22974437376. Its totient is φ = 20118236160.

The previous prime is 21524205011. The next prime is 21524205047. The reversal of 21524205023 is 32050242512.

It is not a de Polignac number, because 21524205023 - 2¹⁶ = 21524139487 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21524204983 and 21524205001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21524255023) 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 15 ways as a sum of consecutive naturals, for example, 677390 + ... + 708452.

It is an arithmetic number, because the mean of its divisors is an integer number (1435902336).

Almost surely, 2^21524205023 is an apocalyptic number.

21524205023 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21524205023 is a deficient number, since it is larger than the sum of its proper divisors (1450232353).

21524205023 is a wasteful number, since it uses less digits than its factorization.

21524205023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31774.

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 21524205023 its reverse (32050242512), we get a palindrome (53574447535).

The spelling of 21524205023 in words is "twenty-one billion, five hundred twenty-four million, two hundred five thousand, twenty-three".