7644110021 has 2 divisors, whose sum is σ = 7644110022. Its totient is φ = 7644110020.

The previous prime is 7644109999. The next prime is 7644110057. The reversal of 7644110021 is 1200114467.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7564650625 + 79459396 = 86975^2 + 8914^2 .

It is an emirp because it is prime and its reverse (1200114467) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7644110021 - 2¹⁴ = 7644093637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7644110081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3822055010 + 3822055011.

It is an arithmetic number, because the mean of its divisors is an integer number (3822055011).

Almost surely, 2^7644110021 is an apocalyptic number.

It is an amenable number.

7644110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

7644110021 is an equidigital number, since it uses as much as digits as its factorization.

7644110021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 7644110021 is about 87430.6011702996. The cubic root of 7644110021 is about 1969.8915158380.

Adding to 7644110021 its reverse (1200114467), we get a palindrome (8844224488).

The spelling of 7644110021 in words is "seven billion, six hundred forty-four million, one hundred ten thousand, twenty-one".