4242512221 has 2 divisors, whose sum is σ = 4242512222. Its totient is φ = 4242512220.

The previous prime is 4242512213. The next prime is 4242512227. The reversal of 4242512221 is 1222152424.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4210192996 + 32319225 = 64886^2 + 5685^2 .

It is a cyclic number.

It is not a de Polignac number, because 4242512221 - 2³ = 4242512213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4242512227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2121256110 + 2121256111.

It is an arithmetic number, because the mean of its divisors is an integer number (2121256111).

Almost surely, 2^4242512221 is an apocalyptic number.

It is an amenable number.

4242512221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4242512221 is an equidigital number, since it uses as much as digits as its factorization.

4242512221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2560, while the sum is 25.

The square root of 4242512221 is about 65134.5700914653. The cubic root of 4242512221 is about 1618.8540670294.

Adding to 4242512221 its reverse (1222152424), we get a palindrome (5464664645).

The spelling of 4242512221 in words is "four billion, two hundred forty-two million, five hundred twelve thousand, two hundred twenty-one".