242041021 has 2 divisors, whose sum is σ = 242041022. Its totient is φ = 242041020.

The previous prime is 242041001. The next prime is 242041043. The reversal of 242041021 is 120140242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 238084900 + 3956121 = 15430^2 + 1989^2 .

It is a cyclic number.

It is not a de Polignac number, because 242041021 - 2⁷ = 242040893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 242040986 and 242041004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242041001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121020510 + 121020511.

It is an arithmetic number, because the mean of its divisors is an integer number (121020511).

Almost surely, 2^242041021 is an apocalyptic number.

It is an amenable number.

242041021 is a deficient number, since it is larger than the sum of its proper divisors (1).

242041021 is an equidigital number, since it uses as much as digits as its factorization.

242041021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 242041021 is about 15557.6675951121. The cubic root of 242041021 is about 623.2031771546.

Adding to 242041021 its reverse (120140242), we get a palindrome (362181263).

The spelling of 242041021 in words is "two hundred forty-two million, forty-one thousand, twenty-one".