23131121129981 has 2 divisors, whose sum is σ = 23131121129982. Its totient is φ = 23131121129980.

The previous prime is 23131121129951. The next prime is 23131121130011. The reversal of 23131121129981 is 18992112113132.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (23131121129951) and next prime (23131121130011).

It can be written as a sum of positive squares in only one way, i.e., 21334154069881 + 1796967060100 = 4618891^2 + 1340510^2 .

It is a cyclic number.

It is not a de Polignac number, because 23131121129981 - 2³⁴ = 23113941260797 is a prime.

It is a super-3 number, since 3×23131121129981³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23131121129911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11565560564990 + 11565560564991.

It is an arithmetic number, because the mean of its divisors is an integer number (11565560564991).

Almost surely, 2^{23131121129981} is an apocalyptic number.

It is an amenable number.

23131121129981 is a deficient number, since it is larger than the sum of its proper divisors (1).

23131121129981 is an equidigital number, since it uses as much as digits as its factorization.

23131121129981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 44.

The spelling of 23131121129981 in words is "twenty-three trillion, one hundred thirty-one billion, one hundred twenty-one million, one hundred twenty-nine thousand, nine hundred eighty-one".