242231021 has 2 divisors, whose sum is σ = 242231022. Its totient is φ = 242231020.

The previous prime is 242230973. The next prime is 242231047. The reversal of 242231021 is 120132242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149108521 + 93122500 = 12211^2 + 9650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242231021 is a 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 (242231221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121115510 + 121115511.

It is an arithmetic number, because the mean of its divisors is an integer number (121115511).

Almost surely, 2^242231021 is an apocalyptic number.

It is an amenable number.

242231021 is a deficient number, since it is larger than the sum of its proper divisors (1).

242231021 is an equidigital number, since it uses as much as digits as its factorization.

242231021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 242231021 is about 15563.7727110107. The cubic root of 242231021 is about 623.3662041124.

Adding to 242231021 its reverse (120132242), we get a palindrome (362363263).

The spelling of 242231021 in words is "two hundred forty-two million, two hundred thirty-one thousand, twenty-one".