242451421 has 2 divisors, whose sum is σ = 242451422. Its totient is φ = 242451420.

The previous prime is 242451413. The next prime is 242451431. The reversal of 242451421 is 124154242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159896025 + 82555396 = 12645^2 + 9086^2 .

It is a cyclic number.

It is not a de Polignac number, because 242451421 - 2³ = 242451413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242451401) 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, 121225710 + 121225711.

It is an arithmetic number, because the mean of its divisors is an integer number (121225711).

Almost surely, 2^242451421 is an apocalyptic number.

It is an amenable number.

242451421 is a deficient number, since it is larger than the sum of its proper divisors (1).

242451421 is an equidigital number, since it uses as much as digits as its factorization.

242451421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2560, while the sum is 25.

The square root of 242451421 is about 15570.8516465863. The cubic root of 242451421 is about 623.5552086181. Note that the first 3 decimals are identical.

The spelling of 242451421 in words is "two hundred forty-two million, four hundred fifty-one thousand, four hundred twenty-one".