4122616721 has 2 divisors, whose sum is σ = 4122616722. Its totient is φ = 4122616720.

The previous prime is 4122616709. The next prime is 4122616759. The reversal of 4122616721 is 1276162214.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3845860225 + 276756496 = 62015^2 + 16636^2 .

It is a cyclic number.

It is not a de Polignac number, because 4122616721 - 2⁶ = 4122616657 is a prime.

It is not a weakly prime, because it can be changed into another prime (4122616321) 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, 2061308360 + 2061308361.

It is an arithmetic number, because the mean of its divisors is an integer number (2061308361).

Almost surely, 2^4122616721 is an apocalyptic number.

It is an amenable number.

4122616721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4122616721 is an equidigital number, since it uses as much as digits as its factorization.

4122616721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 32.

The square root of 4122616721 is about 64207.6064107673. The cubic root of 4122616721 is about 1603.4582388600.

Adding to 4122616721 its reverse (1276162214), we get a palindrome (5398778935).

The spelling of 4122616721 in words is "four billion, one hundred twenty-two million, six hundred sixteen thousand, seven hundred twenty-one".