121605427 has 2 divisors, whose sum is σ = 121605428. Its totient is φ = 121605426.

The previous prime is 121605413. The next prime is 121605443. The reversal of 121605427 is 724506121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121605427 - 2²³ = 113216819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121605395 and 121605404.

It is not a weakly prime, because it can be changed into another prime (121605457) 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, 60802713 + 60802714.

It is an arithmetic number, because the mean of its divisors is an integer number (60802714).

Almost surely, 2^121605427 is an apocalyptic number.

121605427 is a deficient number, since it is larger than the sum of its proper divisors (1).

121605427 is an equidigital number, since it uses as much as digits as its factorization.

121605427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 121605427 is about 11027.4850714023. The cubic root of 121605427 is about 495.4323020031.

The spelling of 121605427 in words is "one hundred twenty-one million, six hundred five thousand, four hundred twenty-seven".