121390811 has 2 divisors, whose sum is σ = 121390812. Its totient is φ = 121390810.

The previous prime is 121390799. The next prime is 121390817. The reversal of 121390811 is 118093121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121390811 - 2¹⁰ = 121389787 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121390817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60695405 + 60695406.

It is an arithmetic number, because the mean of its divisors is an integer number (60695406).

Almost surely, 2^121390811 is an apocalyptic number.

121390811 is a deficient number, since it is larger than the sum of its proper divisors (1).

121390811 is an equidigital number, since it uses as much as digits as its factorization.

121390811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 121390811 is about 11017.7498156384. The cubic root of 121390811 is about 495.1406749106.

The spelling of 121390811 in words is "one hundred twenty-one million, three hundred ninety thousand, eight hundred eleven".