1242042271 has 2 divisors, whose sum is σ = 1242042272. Its totient is φ = 1242042270.

The previous prime is 1242042203. The next prime is 1242042281. The reversal of 1242042271 is 1722402421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1242042271 - 2¹⁷ = 1241911199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242042281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621021135 + 621021136.

It is an arithmetic number, because the mean of its divisors is an integer number (621021136).

Almost surely, 2^1242042271 is an apocalyptic number.

1242042271 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242042271 is an equidigital number, since it uses as much as digits as its factorization.

1242042271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 1242042271 is about 35242.6200927230. The cubic root of 1242042271 is about 1074.9265559343.

Adding to 1242042271 its reverse (1722402421), we get a palindrome (2964444692).

The spelling of 1242042271 in words is "one billion, two hundred forty-two million, forty-two thousand, two hundred seventy-one".