1065624221 has 4 divisors (see below), whose sum is σ = 1075400700. Its totient is φ = 1055847744.

The previous prime is 1065624211. The next prime is 1065624229. The reversal of 1065624221 is 1224265601.

1065624221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 282408025 + 783216196 = 16805^2 + 27986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1065624221 - 2¹⁰ = 1065623197 is a prime.

It is a super-2 number, since 2×1065624221² = 2271109960763713682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1065624229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4888076 + ... + 4888293.

It is an arithmetic number, because the mean of its divisors is an integer number (268850175).

Almost surely, 2^1065624221 is an apocalyptic number.

It is an amenable number.

1065624221 is a deficient number, since it is larger than the sum of its proper divisors (9776479).

1065624221 is an equidigital number, since it uses as much as digits as its factorization.

1065624221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9776478.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 1065624221 is about 32643.9002112186. The cubic root of 1065624221 is about 1021.4129530578.

Adding to 1065624221 its reverse (1224265601), we get a palindrome (2289889822).

The spelling of 1065624221 in words is "one billion, sixty-five million, six hundred twenty-four thousand, two hundred twenty-one".