121368721 has 2 divisors, whose sum is σ = 121368722. Its totient is φ = 121368720.

The previous prime is 121368701. The next prime is 121368743. The reversal of 121368721 is 127863121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115799121 + 5569600 = 10761^2 + 2360^2 .

It is a cyclic number.

It is not a de Polignac number, because 121368721 - 2⁹ = 121368209 is a prime.

It is not a weakly prime, because it can be changed into another prime (121368701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60684360 + 60684361.

It is an arithmetic number, because the mean of its divisors is an integer number (60684361).

Almost surely, 2^121368721 is an apocalyptic number.

It is an amenable number.

121368721 is a deficient number, since it is larger than the sum of its proper divisors (1).

121368721 is an equidigital number, since it uses as much as digits as its factorization.

121368721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 31.

The square root of 121368721 is about 11016.7472967296. The cubic root of 121368721 is about 495.1106388067.

The spelling of 121368721 in words is "one hundred twenty-one million, three hundred sixty-eight thousand, seven hundred twenty-one".