21040032125 has 32 divisors (see below), whose sum is σ = 30095520000. Its totient is φ = 14385902400.

The previous prime is 21040032113. The next prime is 21040032127. The reversal of 21040032125 is 52123004012.

It is not a de Polignac number, because 21040032125 - 2¹⁸ = 21039769981 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21040032097 and 21040032106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21040032127) 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, 270926 + ... + 339824.

It is an arithmetic number, because the mean of its divisors is an integer number (940485000).

Almost surely, 2^21040032125 is an apocalyptic number.

21040032125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21040032125 is a deficient number, since it is larger than the sum of its proper divisors (9055487875).

21040032125 is an equidigital number, since it uses as much as digits as its factorization.

21040032125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69270 (or 69260 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21040032125 its reverse (52123004012), we get a palindrome (73163036137).

The spelling of 21040032125 in words is "twenty-one billion, forty million, thirty-two thousand, one hundred twenty-five".