121415442809 has 2 divisors, whose sum is σ = 121415442810. Its totient is φ = 121415442808.

The previous prime is 121415442779. The next prime is 121415442817. The reversal of 121415442809 is 908244514121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108881520784 + 12533922025 = 329972^2 + 111955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121415442809 is a prime.

It is not a weakly prime, because it can be changed into another prime (121415448809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60707721404 + 60707721405.

It is an arithmetic number, because the mean of its divisors is an integer number (60707721405).

Almost surely, 2^121415442809 is an apocalyptic number.

It is an amenable number.

121415442809 is a deficient number, since it is larger than the sum of its proper divisors (1).

121415442809 is an equidigital number, since it uses as much as digits as its factorization.

121415442809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92160, while the sum is 41.

The spelling of 121415442809 in words is "one hundred twenty-one billion, four hundred fifteen million, four hundred forty-two thousand, eight hundred nine".