21431133125 has 40 divisors (see below), whose sum is σ = 29099685120. Its totient is φ = 15718320000.

The previous prime is 21431133121. The next prime is 21431133151. The reversal of 21431133125 is 52133113412.

It is not a de Polignac number, because 21431133125 - 2² = 21431133121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21431133094 and 21431133103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431133121) 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 39 ways as a sum of consecutive naturals, for example, 339017 + ... + 397233.

It is an arithmetic number, because the mean of its divisors is an integer number (727492128).

Almost surely, 2^21431133125 is an apocalyptic number.

21431133125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21431133125 is a deficient number, since it is larger than the sum of its proper divisors (7668551995).

21431133125 is an equidigital number, since it uses as much as digits as its factorization.

21431133125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58287 (or 58272 counting only the distinct ones).

The product of its digits is 2160, while the sum is 26.

Adding to 21431133125 its reverse (52133113412), we get a palindrome (73564246537).

The spelling of 21431133125 in words is "twenty-one billion, four hundred thirty-one million, one hundred thirty-three thousand, one hundred twenty-five".