242211421 has 2 divisors, whose sum is σ = 242211422. Its totient is φ = 242211420.

The previous prime is 242211391. The next prime is 242211439. The reversal of 242211421 is 124112242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 238548025 + 3663396 = 15445^2 + 1914^2 .

It is a cyclic number.

It is not a de Polignac number, because 242211421 - 2¹³ = 242203229 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 (242211491) 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, 121105710 + 121105711.

It is an arithmetic number, because the mean of its divisors is an integer number (121105711).

Almost surely, 2^242211421 is an apocalyptic number.

It is an amenable number.

242211421 is a deficient number, since it is larger than the sum of its proper divisors (1).

242211421 is an equidigital number, since it uses as much as digits as its factorization.

242211421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 256, while the sum is 19.

The square root of 242211421 is about 15563.1430308919. The cubic root of 242211421 is about 623.3493905390.

Adding to 242211421 its reverse (124112242), we get a palindrome (366323663).

The spelling of 242211421 in words is "two hundred forty-two million, two hundred eleven thousand, four hundred twenty-one".