21131350025121 has 48 divisors (see below), whose sum is σ = 38559006089280. Its totient is φ = 11364759665280.

The previous prime is 21131350025117. The next prime is 21131350025143. The reversal of 21131350025121 is 12152005313112.

21131350025121 is a `hidden beast` number, since 2 + 1 + 1 + 3 + 13 + 500 + 25 + 121 = 666.

It is not a de Polignac number, because 21131350025121 - 2² = 21131350025117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21131350025921) 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 47 ways as a sum of consecutive naturals, for example, 469750975 + ... + 469795956.

It is an arithmetic number, because the mean of its divisors is an integer number (803312626860).

Almost surely, 2^{21131350025121} is an apocalyptic number.

21131350025121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21131350025121 is a deficient number, since it is larger than the sum of its proper divisors (17427656064159).

21131350025121 is a wasteful number, since it uses less digits than its factorization.

21131350025121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939546971 (or 939546958 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

Adding to 21131350025121 its reverse (12152005313112), we get a palindrome (33283355338233).

The spelling of 21131350025121 in words is "twenty-one trillion, one hundred thirty-one billion, three hundred fifty million, twenty-five thousand, one hundred twenty-one".