12102201001981 has 2 divisors, whose sum is σ = 12102201001982. Its totient is φ = 12102201001980.

The previous prime is 12102201001963. The next prime is 12102201002071. The reversal of 12102201001981 is 18910010220121.

12102201001981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11092696524900 + 1009504477081 = 3330570^2 + 1004741^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12102201001981 is a prime.

It is a super-2 number, since 2×12102201001981² (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 (12102201001901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6051100500990 + 6051100500991.

It is an arithmetic number, because the mean of its divisors is an integer number (6051100500991).

Almost surely, 2^{12102201001981} is an apocalyptic number.

It is an amenable number.

12102201001981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12102201001981 is an equidigital number, since it uses as much as digits as its factorization.

12102201001981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 28.

The spelling of 12102201001981 in words is "twelve trillion, one hundred two billion, two hundred one million, one thousand, nine hundred eighty-one".