121818811 has 2 divisors, whose sum is σ = 121818812. Its totient is φ = 121818810.

The previous prime is 121818793. The next prime is 121818817. The reversal of 121818811 is 118818121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121818811 - 2⁵ = 121818779 is a prime.

It is not a weakly prime, because it can be changed into another prime (121818817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60909405 + 60909406.

It is an arithmetic number, because the mean of its divisors is an integer number (60909406).

Almost surely, 2^121818811 is an apocalyptic number.

121818811 is a deficient number, since it is larger than the sum of its proper divisors (1).

121818811 is an equidigital number, since it uses as much as digits as its factorization.

121818811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1024, while the sum is 31.

The square root of 121818811 is about 11037.1559289520. The cubic root of 121818811 is about 495.7219150416.

The spelling of 121818811 in words is "one hundred twenty-one million, eight hundred eighteen thousand, eight hundred eleven".