10120013011981 has 2 divisors, whose sum is σ = 10120013011982. Its totient is φ = 10120013011980.

The previous prime is 10120013011961. The next prime is 10120013012051. The reversal of 10120013011981 is 18911031002101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6863828851881 + 3256184160100 = 2619891^2 + 1804490^2 .

It is a cyclic number.

It is not a de Polignac number, because 10120013011981 - 2⁷ = 10120013011853 is a prime.

It is a super-2 number, since 2×10120013011981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10120013011961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5060006505990 + 5060006505991.

It is an arithmetic number, because the mean of its divisors is an integer number (5060006505991).

Almost surely, 2^{10120013011981} is an apocalyptic number.

It is an amenable number.

10120013011981 is a deficient number, since it is larger than the sum of its proper divisors (1).

10120013011981 is an equidigital number, since it uses as much as digits as its factorization.

10120013011981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 28.

The spelling of 10120013011981 in words is "ten trillion, one hundred twenty billion, thirteen million, eleven thousand, nine hundred eighty-one".