121209401 has 2 divisors, whose sum is σ = 121209402. Its totient is φ = 121209400.

The previous prime is 121209397. The next prime is 121209409. The reversal of 121209401 is 104902121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118810000 + 2399401 = 10900^2 + 1549^2 .

It is a cyclic number.

It is not a de Polignac number, because 121209401 - 2² = 121209397 is a prime.

It is a super-3 number, since 3×121209401³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (121209409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60604700 + 60604701.

It is an arithmetic number, because the mean of its divisors is an integer number (60604701).

Almost surely, 2^121209401 is an apocalyptic number.

It is an amenable number.

121209401 is a deficient number, since it is larger than the sum of its proper divisors (1).

121209401 is an equidigital number, since it uses as much as digits as its factorization.

121209401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 121209401 is about 11009.5141128026. The cubic root of 121209401 is about 494.8939010095.

The spelling of 121209401 in words is "one hundred twenty-one million, two hundred nine thousand, four hundred one".