21040324125 has 32 divisors (see below), whose sum is σ = 37070587008. Its totient is φ = 10561414400.

The previous prime is 21040324111. The next prime is 21040324127. The reversal of 21040324125 is 52142304012.

It is not a de Polignac number, because 21040324125 - 2⁸ = 21040323869 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21040324095 and 21040324104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21040324127) 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 31 ways as a sum of consecutive naturals, for example, 1643847 + ... + 1656596.

It is an arithmetic number, because the mean of its divisors is an integer number (1158455844).

Almost surely, 2^21040324125 is an apocalyptic number.

21040324125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21040324125 is a deficient number, since it is larger than the sum of its proper divisors (16030262883).

21040324125 is a wasteful number, since it uses less digits than its factorization.

21040324125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3300478 (or 3300468 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 21040324125 its reverse (52142304012), we get a palindrome (73182628137).

The spelling of 21040324125 in words is "twenty-one billion, forty million, three hundred twenty-four thousand, one hundred twenty-five".