121243819 has 2 divisors, whose sum is σ = 121243820. Its totient is φ = 121243818.

The previous prime is 121243781. The next prime is 121243841. The reversal of 121243819 is 918342121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121243819 - 2¹³ = 121235627 is a prime.

It is a super-2 number, since 2×121243819² = 29400127291409522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121243319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60621909 + 60621910.

It is an arithmetic number, because the mean of its divisors is an integer number (60621910).

Almost surely, 2^121243819 is an apocalyptic number.

121243819 is a deficient number, since it is larger than the sum of its proper divisors (1).

121243819 is an equidigital number, since it uses as much as digits as its factorization.

121243819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 31.

The square root of 121243819 is about 11011.0771044435. The cubic root of 121243819 is about 494.9407390880.

The spelling of 121243819 in words is "one hundred twenty-one million, two hundred forty-three thousand, eight hundred nineteen".