21040031425 has 192 divisors, whose sum is σ = 34712064000. Its totient is φ = 12315663360.

The previous prime is 21040031393. The next prime is 21040031429. The reversal of 21040031425 is 52413004012.

It is not a de Polignac number, because 21040031425 - 2⁵ = 21040031393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21040031396 and 21040031405.

It is not an unprimeable number, because it can be changed into a prime (21040031429) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 117541986 + ... + 117542164.

It is an arithmetic number, because the mean of its divisors is an integer number (180792000).

Almost surely, 2^21040031425 is an apocalyptic number.

21040031425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21040031425 is a deficient number, since it is larger than the sum of its proper divisors (13672032575).

21040031425 is a wasteful number, since it uses less digits than its factorization.

21040031425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320 (or 315 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21040031425 its reverse (52413004012), we get a palindrome (73453035437).

The spelling of 21040031425 in words is "twenty-one billion, forty million, thirty-one thousand, four hundred twenty-five".