1252240421 has 2 divisors, whose sum is σ = 1252240422. Its totient is φ = 1252240420.

The previous prime is 1252240373. The next prime is 1252240459. The reversal of 1252240421 is 1240422521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1204437025 + 47803396 = 34705^2 + 6914^2 .

It is a cyclic number.

It is not a de Polignac number, because 1252240421 - 2⁶ = 1252240357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1252240481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626120210 + 626120211.

It is an arithmetic number, because the mean of its divisors is an integer number (626120211).

Almost surely, 2^1252240421 is an apocalyptic number.

It is an amenable number.

1252240421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1252240421 is an equidigital number, since it uses as much as digits as its factorization.

1252240421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 1252240421 is about 35387.0092124214. The cubic root of 1252240421 is about 1077.8605396581.

Adding to 1252240421 its reverse (1240422521), we get a palindrome (2492662942).

The spelling of 1252240421 in words is "one billion, two hundred fifty-two million, two hundred forty thousand, four hundred twenty-one".