121225121 has 2 divisors, whose sum is σ = 121225122. Its totient is φ = 121225120.

The previous prime is 121225099. The next prime is 121225171. The reversal of 121225121 is 121522121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120143521 + 1081600 = 10961^2 + 1040^2 .

It is a cyclic number.

It is not a de Polignac number, because 121225121 - 2¹⁰ = 121224097 is a prime.

It is a super-2 number, since 2×121225121² = 29391059922929282, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121225121.

It is not a weakly prime, because it can be changed into another prime (121225171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60612560 + 60612561.

It is an arithmetic number, because the mean of its divisors is an integer number (60612561).

Almost surely, 2^121225121 is an apocalyptic number.

It is an amenable number.

121225121 is a deficient number, since it is larger than the sum of its proper divisors (1).

121225121 is an equidigital number, since it uses as much as digits as its factorization.

121225121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80, while the sum is 17.

The square root of 121225121 is about 11010.2280176207. The cubic root of 121225121 is about 494.9152948281.

Adding to 121225121 its reverse (121522121), we get a palindrome (242747242).

The spelling of 121225121 in words is "one hundred twenty-one million, two hundred twenty-five thousand, one hundred twenty-one".