242147621 has 2 divisors, whose sum is σ = 242147622. Its totient is φ = 242147620.

The previous prime is 242147617. The next prime is 242147627. The reversal of 242147621 is 126741242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 238857025 + 3290596 = 15455^2 + 1814^2 .

It is a cyclic number.

It is not a de Polignac number, because 242147621 - 2² = 242147617 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242147627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121073810 + 121073811.

It is an arithmetic number, because the mean of its divisors is an integer number (121073811).

Almost surely, 2^242147621 is an apocalyptic number.

It is an amenable number.

242147621 is a deficient number, since it is larger than the sum of its proper divisors (1).

242147621 is an equidigital number, since it uses as much as digits as its factorization.

242147621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 29.

The square root of 242147621 is about 15561.0931813931. The cubic root of 242147621 is about 623.2946543594.

Adding to 242147621 its reverse (126741242), we get a palindrome (368888863).

The spelling of 242147621 in words is "two hundred forty-two million, one hundred forty-seven thousand, six hundred twenty-one".