12421132109 has 2 divisors, whose sum is σ = 12421132110. Its totient is φ = 12421132108.

The previous prime is 12421132007. The next prime is 12421132271. The reversal of 12421132109 is 90123112421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8244095209 + 4177036900 = 90797^2 + 64630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12421132109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12421132309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6210566054 + 6210566055.

It is an arithmetic number, because the mean of its divisors is an integer number (6210566055).

Almost surely, 2^12421132109 is an apocalyptic number.

It is an amenable number.

12421132109 is a deficient number, since it is larger than the sum of its proper divisors (1).

12421132109 is an equidigital number, since it uses as much as digits as its factorization.

12421132109 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 26.

The spelling of 12421132109 in words is "twelve billion, four hundred twenty-one million, one hundred thirty-two thousand, one hundred nine".