12421972081 has 2 divisors, whose sum is σ = 12421972082. Its totient is φ = 12421972080.

The previous prime is 12421972061. The next prime is 12421972093. The reversal of 12421972081 is 18027912421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10177581456 + 2244390625 = 100884^2 + 47375^2 .

It is a cyclic number.

It is not a de Polignac number, because 12421972081 - 2⁷ = 12421971953 is a prime.

It is a super-2 number, since 2×12421972081² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12421972081.

It is not a weakly prime, because it can be changed into another prime (12421972061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6210986040 + 6210986041.

It is an arithmetic number, because the mean of its divisors is an integer number (6210986041).

Almost surely, 2^12421972081 is an apocalyptic number.

It is an amenable number.

12421972081 is a deficient number, since it is larger than the sum of its proper divisors (1).

12421972081 is an equidigital number, since it uses as much as digits as its factorization.

12421972081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 37.

The spelling of 12421972081 in words is "twelve billion, four hundred twenty-one million, nine hundred seventy-two thousand, eighty-one".