4222636721 has 2 divisors, whose sum is σ = 4222636722. Its totient is φ = 4222636720.

The previous prime is 4222636711. The next prime is 4222636757. The reversal of 4222636721 is 1276362224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4036696225 + 185940496 = 63535^2 + 13636^2 .

It is a cyclic number.

It is not a de Polignac number, because 4222636721 - 2⁶ = 4222636657 is a prime.

It is not a weakly prime, because it can be changed into another prime (4222636711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2111318360 + 2111318361.

It is an arithmetic number, because the mean of its divisors is an integer number (2111318361).

Almost surely, 2^4222636721 is an apocalyptic number.

It is an amenable number.

4222636721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4222636721 is an equidigital number, since it uses as much as digits as its factorization.

4222636721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 35.

The square root of 4222636721 is about 64981.8183879152. The cubic root of 4222636721 is about 1616.3220836761.

Adding to 4222636721 its reverse (1276362224), we get a palindrome (5498998945).

The spelling of 4222636721 in words is "four billion, two hundred twenty-two million, six hundred thirty-six thousand, seven hundred twenty-one".