242123281 has 2 divisors, whose sum is σ = 242123282. Its totient is φ = 242123280.

The previous prime is 242123279. The next prime is 242123317. The reversal of 242123281 is 182321242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200081025 + 42042256 = 14145^2 + 6484^2 .

It is a cyclic number.

It is not a de Polignac number, because 242123281 - 2¹ = 242123279 is a prime.

It is a super-2 number, since 2×242123281² = 117247366404409922, which contains 22 as substring.

Together with 242123279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (242123381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121061640 + 121061641.

It is an arithmetic number, because the mean of its divisors is an integer number (121061641).

Almost surely, 2^242123281 is an apocalyptic number.

It is an amenable number.

242123281 is a deficient number, since it is larger than the sum of its proper divisors (1).

242123281 is an equidigital number, since it uses as much as digits as its factorization.

242123281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536, while the sum is 25.

The square root of 242123281 is about 15560.3110830086. The cubic root of 242123281 is about 623.2737697159.

The spelling of 242123281 in words is "two hundred forty-two million, one hundred twenty-three thousand, two hundred eighty-one".