12236912921 has 2 divisors, whose sum is σ = 12236912922. Its totient is φ = 12236912920.

The previous prime is 12236912917. The next prime is 12236912951. The reversal of 12236912921 is 12921963221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12218207296 + 18705625 = 110536^2 + 4325^2 .

It is an emirp because it is prime and its reverse (12921963221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12236912921 - 2² = 12236912917 is a prime.

It is a super-2 number, since 2×12236912921² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12236912951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6118456460 + 6118456461.

It is an arithmetic number, because the mean of its divisors is an integer number (6118456461).

Almost surely, 2^12236912921 is an apocalyptic number.

It is an amenable number.

12236912921 is a deficient number, since it is larger than the sum of its proper divisors (1).

12236912921 is an equidigital number, since it uses as much as digits as its factorization.

12236912921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The spelling of 12236912921 in words is "twelve billion, two hundred thirty-six million, nine hundred twelve thousand, nine hundred twenty-one".