242235442721 has 2 divisors, whose sum is σ = 242235442722. Its totient is φ = 242235442720.

The previous prime is 242235442693. The next prime is 242235442739. The reversal of 242235442721 is 127244532242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230170617121 + 12064825600 = 479761^2 + 109840^2 .

It is a cyclic number.

It is not a de Polignac number, because 242235442721 - 2²² = 242231248417 is a prime.

It is not a weakly prime, because it can be changed into another prime (242235442921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121117721360 + 121117721361.

It is an arithmetic number, because the mean of its divisors is an integer number (121117721361).

Almost surely, 2^242235442721 is an apocalyptic number.

It is an amenable number.

242235442721 is a deficient number, since it is larger than the sum of its proper divisors (1).

242235442721 is an equidigital number, since it uses as much as digits as its factorization.

242235442721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 215040, while the sum is 38.

Adding to 242235442721 its reverse (127244532242), we get a palindrome (369479974963).

The spelling of 242235442721 in words is "two hundred forty-two billion, two hundred thirty-five million, four hundred forty-two thousand, seven hundred twenty-one".