20121025131 has 32 divisors (see below), whose sum is σ = 31002301440. Its totient is φ = 12887229600.

The previous prime is 20121025109. The next prime is 20121025139. The reversal of 20121025131 is 13152012102.

20121025131 is a `hidden beast` number, since 201 + 210 + 251 + 3 + 1 = 666.

It is not a de Polignac number, because 20121025131 - 2²² = 20116830827 is a prime.

It is a super-2 number, since 2×20121025131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20121025139) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71235 + ... + 212876.

It is an arithmetic number, because the mean of its divisors is an integer number (968821920).

Almost surely, 2^20121025131 is an apocalyptic number.

20121025131 is a deficient number, since it is larger than the sum of its proper divisors (10881276309).

20121025131 is a wasteful number, since it uses less digits than its factorization.

20121025131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284224 (or 284218 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 20121025131 its reverse (13152012102), we get a palindrome (33273037233).

The spelling of 20121025131 in words is "twenty billion, one hundred twenty-one million, twenty-five thousand, one hundred thirty-one".