121209107 has 2 divisors, whose sum is σ = 121209108. Its totient is φ = 121209106.

The previous prime is 121209091. The next prime is 121209139. The reversal of 121209107 is 701902121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121209107 - 2⁴ = 121209091 is a prime.

It is not a weakly prime, because it can be changed into another prime (121209007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60604553 + 60604554.

It is an arithmetic number, because the mean of its divisors is an integer number (60604554).

Almost surely, 2^121209107 is an apocalyptic number.

121209107 is a deficient number, since it is larger than the sum of its proper divisors (1).

121209107 is an equidigital number, since it uses as much as digits as its factorization.

121209107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 121209107 is about 11009.5007607066. The cubic root of 121209107 is about 494.8935008785.

The spelling of 121209107 in words is "one hundred twenty-one million, two hundred nine thousand, one hundred seven".