242806021 has 2 divisors, whose sum is σ = 242806022. Its totient is φ = 242806020.

The previous prime is 242806007. The next prime is 242806033. The reversal of 242806021 is 120608242.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202037796 + 40768225 = 14214^2 + 6385^2 .

It is a cyclic number.

It is not a de Polignac number, because 242806021 - 2⁵ = 242805989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242806001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121403010 + 121403011.

It is an arithmetic number, because the mean of its divisors is an integer number (121403011).

Almost surely, 2^242806021 is an apocalyptic number.

It is an amenable number.

242806021 is a deficient number, since it is larger than the sum of its proper divisors (1).

242806021 is an equidigital number, since it uses as much as digits as its factorization.

242806021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 242806021 is about 15582.2341466171. The cubic root of 242806021 is about 623.8590563837.

The spelling of 242806021 in words is "two hundred forty-two million, eight hundred six thousand, twenty-one".