242042221 has 2 divisors, whose sum is σ = 242042222. Its totient is φ = 242042220.

The previous prime is 242042219. The next prime is 242042233. The reversal of 242042221 is 122240242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203775625 + 38266596 = 14275^2 + 6186^2 .

It is a cyclic number.

It is not a de Polignac number, because 242042221 - 2¹ = 242042219 is a prime.

It is a super-2 number, since 2×242042221² = 117168873493225682, which contains 22 as substring.

Together with 242042219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242042261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121021110 + 121021111.

It is an arithmetic number, because the mean of its divisors is an integer number (121021111).

Almost surely, 2^242042221 is an apocalyptic number.

It is an amenable number.

242042221 is a deficient number, since it is larger than the sum of its proper divisors (1).

242042221 is an equidigital number, since it uses as much as digits as its factorization.

242042221 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 242042221 is about 15557.7061612565. The cubic root of 242042221 is about 623.2042070662.

Adding to 242042221 its reverse (122240242), we get a palindrome (364282463).

The spelling of 242042221 in words is "two hundred forty-two million, forty-two thousand, two hundred twenty-one".