121428427 has 2 divisors, whose sum is σ = 121428428. Its totient is φ = 121428426.

The previous prime is 121428421. The next prime is 121428469. The reversal of 121428427 is 724824121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121428427 - 2⁷ = 121428299 is a prime.

It is not a weakly prime, because it can be changed into another prime (121428421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60714213 + 60714214.

It is an arithmetic number, because the mean of its divisors is an integer number (60714214).

Almost surely, 2^121428427 is an apocalyptic number.

121428427 is a deficient number, since it is larger than the sum of its proper divisors (1).

121428427 is an equidigital number, since it uses as much as digits as its factorization.

121428427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7168, while the sum is 31.

The square root of 121428427 is about 11019.4567470452. The cubic root of 121428427 is about 495.1918135648.

The spelling of 121428427 in words is "one hundred twenty-one million, four hundred twenty-eight thousand, four hundred twenty-seven".