121215907 has 2 divisors, whose sum is σ = 121215908. Its totient is φ = 121215906.

The previous prime is 121215889. The next prime is 121215917. The reversal of 121215907 is 709512121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121215907 is a prime.

It is a super-2 number, since 2×121215907² = 29386592219665298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121215917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60607953 + 60607954.

It is an arithmetic number, because the mean of its divisors is an integer number (60607954).

Almost surely, 2^121215907 is an apocalyptic number.

121215907 is a deficient number, since it is larger than the sum of its proper divisors (1).

121215907 is an equidigital number, since it uses as much as digits as its factorization.

121215907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 121215907 is about 11009.8095805513. The cubic root of 121215907 is about 494.9027554440.

The spelling of 121215907 in words is "one hundred twenty-one million, two hundred fifteen thousand, nine hundred seven".