21403858131 has 24 divisors (see below), whose sum is σ = 32556064320. Its totient is φ = 13513164336.

The previous prime is 21403858051. The next prime is 21403858141. The reversal of 21403858131 is 13185830412.

21403858131 is a `hidden beast` number, since 2 + 1 + 40 + 3 + 8 + 581 + 31 = 666.

It is not a de Polignac number, because 21403858131 - 2⁹ = 21403857619 is a prime.

It is a super-2 number, since 2×21403858131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21403858141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 464140 + ... + 508166.

It is an arithmetic number, because the mean of its divisors is an integer number (1356502680).

Almost surely, 2^21403858131 is an apocalyptic number.

21403858131 is a deficient number, since it is larger than the sum of its proper divisors (11152206189).

21403858131 is a wasteful number, since it uses less digits than its factorization.

21403858131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46895 (or 46892 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 21403858131 in words is "twenty-one billion, four hundred three million, eight hundred fifty-eight thousand, one hundred thirty-one".