242021999 has 2 divisors, whose sum is σ = 242022000. Its totient is φ = 242021998.

The previous prime is 242021977. The next prime is 242022007. The reversal of 242021999 is 999120242.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 242021999 - 2²⁴ = 225244783 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242011999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121010999 + 121011000.

It is an arithmetic number, because the mean of its divisors is an integer number (121011000).

Almost surely, 2^242021999 is an apocalyptic number.

242021999 is a deficient number, since it is larger than the sum of its proper divisors (1).

242021999 is an equidigital number, since it uses as much as digits as its factorization.

242021999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 242021999 is about 15557.0562446756. The cubic root of 242021999 is about 623.1868508843.

The spelling of 242021999 in words is "two hundred forty-two million, twenty-one thousand, nine hundred ninety-nine".