242422021 has 2 divisors, whose sum is σ = 242422022. Its totient is φ = 242422020.

The previous prime is 242421979. The next prime is 242422051. The reversal of 242422021 is 120224242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 239320900 + 3101121 = 15470^2 + 1761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242422021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 242422021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242422051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121211010 + 121211011.

It is an arithmetic number, because the mean of its divisors is an integer number (121211011).

Almost surely, 2^242422021 is an apocalyptic number.

It is an amenable number.

242422021 is a deficient number, since it is larger than the sum of its proper divisors (1).

242422021 is an equidigital number, since it uses as much as digits as its factorization.

242422021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 242422021 is about 15569.9075462894. The cubic root of 242422021 is about 623.5300032057.

Adding to 242422021 its reverse (120224242), we get a palindrome (362646263).

The spelling of 242422021 in words is "two hundred forty-two million, four hundred twenty-two thousand, twenty-one".