12209488721 has 2 divisors, whose sum is σ = 12209488722. Its totient is φ = 12209488720.

The previous prime is 12209488703. The next prime is 12209488741. The reversal of 12209488721 is 12788490221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12152637121 + 56851600 = 110239^2 + 7540^2 .

It is a cyclic number.

It is not a de Polignac number, because 12209488721 - 2⁶ = 12209488657 is a prime.

It is a super-2 number, since 2×12209488721² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12209488741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6104744360 + 6104744361.

It is an arithmetic number, because the mean of its divisors is an integer number (6104744361).

Almost surely, 2^12209488721 is an apocalyptic number.

It is an amenable number.

12209488721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12209488721 is an equidigital number, since it uses as much as digits as its factorization.

12209488721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129024, while the sum is 44.

The spelling of 12209488721 in words is "twelve billion, two hundred nine million, four hundred eighty-eight thousand, seven hundred twenty-one".