242921807 has 2 divisors, whose sum is σ = 242921808. Its totient is φ = 242921806.

The previous prime is 242921801. The next prime is 242921831. The reversal of 242921807 is 708129242.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 242921807 - 2¹² = 242917711 is a prime.

It is a super-2 number, since 2×242921807² = 118022008632290498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242921801) 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, 121460903 + 121460904.

It is an arithmetic number, because the mean of its divisors is an integer number (121460904).

Almost surely, 2^242921807 is an apocalyptic number.

242921807 is a deficient number, since it is larger than the sum of its proper divisors (1).

242921807 is an equidigital number, since it uses as much as digits as its factorization.

242921807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 242921807 is about 15585.9490246825. The cubic root of 242921807 is about 623.9582064040.

The spelling of 242921807 in words is "two hundred forty-two million, nine hundred twenty-one thousand, eight hundred seven".