12273273721 has 2 divisors, whose sum is σ = 12273273722. Its totient is φ = 12273273720.

The previous prime is 12273273713. The next prime is 12273273769. The reversal of 12273273721 is 12737237221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7269267600 + 5004006121 = 85260^2 + 70739^2 .

It is an emirp because it is prime and its reverse (12737237221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12273273721 - 2³ = 12273273713 is a prime.

It is not a weakly prime, because it can be changed into another prime (12273273791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6136636860 + 6136636861.

It is an arithmetic number, because the mean of its divisors is an integer number (6136636861).

Almost surely, 2^12273273721 is an apocalyptic number.

It is an amenable number.

12273273721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12273273721 is an equidigital number, since it uses as much as digits as its factorization.

12273273721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49392, while the sum is 37.

The spelling of 12273273721 in words is "twelve billion, two hundred seventy-three million, two hundred seventy-three thousand, seven hundred twenty-one".