11113421011981 has 2 divisors, whose sum is σ = 11113421011982. Its totient is φ = 11113421011980.

The previous prime is 11113421011951. The next prime is 11113421012051. The reversal of 11113421011981 is 18911012431111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7011718641225 + 4101702370756 = 2647965^2 + 2025266^2 .

It is a cyclic number.

It is not a de Polignac number, because 11113421011981 - 2⁷ = 11113421011853 is a prime.

It is a super-2 number, since 2×11113421011981² (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 (11113421011921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5556710505990 + 5556710505991.

It is an arithmetic number, because the mean of its divisors is an integer number (5556710505991).

Almost surely, 2^{11113421011981} is an apocalyptic number.

It is an amenable number.

11113421011981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11113421011981 is an equidigital number, since it uses as much as digits as its factorization.

11113421011981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 34.

The spelling of 11113421011981 in words is "eleven trillion, one hundred thirteen billion, four hundred twenty-one million, eleven thousand, nine hundred eighty-one".