12102113981 has 2 divisors, whose sum is σ = 12102113982. Its totient is φ = 12102113980.

The previous prime is 12102113953. The next prime is 12102113993. The reversal of 12102113981 is 18931120121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10601791225 + 1500322756 = 102965^2 + 38734^2 .

It is an emirp because it is prime and its reverse (18931120121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12102113981 - 2¹⁴ = 12102097597 is a prime.

It is a super-2 number, since 2×12102113981² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12102113381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6051056990 + 6051056991.

It is an arithmetic number, because the mean of its divisors is an integer number (6051056991).

Almost surely, 2^12102113981 is an apocalyptic number.

It is an amenable number.

12102113981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12102113981 is an equidigital number, since it uses as much as digits as its factorization.

12102113981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 29.

The spelling of 12102113981 in words is "twelve billion, one hundred two million, one hundred thirteen thousand, nine hundred eighty-one".