242877221 has 2 divisors, whose sum is σ = 242877222. Its totient is φ = 242877220.

The previous prime is 242877199. The next prime is 242877227. The reversal of 242877221 is 122778242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235960321 + 6916900 = 15361^2 + 2630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242877221 is a prime.

It is a Sophie Germain prime.

It is a Chen 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 (242877227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121438610 + 121438611.

It is an arithmetic number, because the mean of its divisors is an integer number (121438611).

Almost surely, 2^242877221 is an apocalyptic number.

It is an amenable number.

242877221 is a deficient number, since it is larger than the sum of its proper divisors (1).

242877221 is an equidigital number, since it uses as much as digits as its factorization.

242877221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25088, while the sum is 35.

The square root of 242877221 is about 15584.5186322838. The cubic root of 242877221 is about 623.9200301925.

The spelling of 242877221 in words is "two hundred forty-two million, eight hundred seventy-seven thousand, two hundred twenty-one".