121965121 has 2 divisors, whose sum is σ = 121965122. Its totient is φ = 121965120.

The previous prime is 121965101. The next prime is 121965131. The reversal of 121965121 is 121569121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121881600 + 83521 = 11040^2 + 289^2 .

It is a cyclic number.

It is not a de Polignac number, because 121965121 - 2¹⁷ = 121834049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121965121.

It is not a weakly prime, because it can be changed into another prime (121965101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60982560 + 60982561.

It is an arithmetic number, because the mean of its divisors is an integer number (60982561).

Almost surely, 2^121965121 is an apocalyptic number.

It is an amenable number.

121965121 is a deficient number, since it is larger than the sum of its proper divisors (1).

121965121 is an equidigital number, since it uses as much as digits as its factorization.

121965121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 28.

The square root of 121965121 is about 11043.7820061789. The cubic root of 121965121 is about 495.9202972543.

The spelling of 121965121 in words is "one hundred twenty-one million, nine hundred sixty-five thousand, one hundred twenty-one".