121357811 has 2 divisors, whose sum is σ = 121357812. Its totient is φ = 121357810.

The previous prime is 121357787. The next prime is 121357813. The reversal of 121357811 is 118753121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121357811 - 2¹⁰ = 121356787 is a prime.

Together with 121357813, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121357813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60678905 + 60678906.

It is an arithmetic number, because the mean of its divisors is an integer number (60678906).

Almost surely, 2^121357811 is an apocalyptic number.

121357811 is a deficient number, since it is larger than the sum of its proper divisors (1).

121357811 is an equidigital number, since it uses as much as digits as its factorization.

121357811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 29.

The square root of 121357811 is about 11016.2521303754. The cubic root of 121357811 is about 495.0958029718.

The spelling of 121357811 in words is "one hundred twenty-one million, three hundred fifty-seven thousand, eight hundred eleven".