121159721 has 2 divisors, whose sum is σ = 121159722. Its totient is φ = 121159720.

The previous prime is 121159679. The next prime is 121159729. The reversal of 121159721 is 127951121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118483225 + 2676496 = 10885^2 + 1636^2 .

It is a cyclic number.

It is not a de Polignac number, because 121159721 - 2⁶ = 121159657 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (121159729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60579860 + 60579861.

It is an arithmetic number, because the mean of its divisors is an integer number (60579861).

Almost surely, 2^121159721 is an apocalyptic number.

It is an amenable number.

121159721 is a deficient number, since it is larger than the sum of its proper divisors (1).

121159721 is an equidigital number, since it uses as much as digits as its factorization.

121159721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260, while the sum is 29.

The square root of 121159721 is about 11007.2576512045. The cubic root of 121159721 is about 494.8262778476.

The spelling of 121159721 in words is "one hundred twenty-one million, one hundred fifty-nine thousand, seven hundred twenty-one".