4244345521 has 4 divisors (see below), whose sum is σ = 4570833652. Its totient is φ = 3917857392.

The previous prime is 4244345467. The next prime is 4244345527. The reversal of 4244345521 is 1255434424.

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 1471796496 + 2772549025 = 38364^2 + 52655^2 .

It is a cyclic number.

It is not a de Polignac number, because 4244345521 - 2⁷ = 4244345393 is a prime.

It is a super-2 number, since 2×4244345521² = 36028937803265522882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4244345527) 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, 163244046 + ... + 163244071.

It is an arithmetic number, because the mean of its divisors is an integer number (1142708413).

Almost surely, 2^4244345521 is an apocalyptic number.

It is an amenable number.

4244345521 is a deficient number, since it is larger than the sum of its proper divisors (326488131).

4244345521 is a wasteful number, since it uses less digits than its factorization.

4244345521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326488130.

The product of its digits is 76800, while the sum is 34.

The square root of 4244345521 is about 65148.6417433242. The cubic root of 4244345521 is about 1619.0872164477.

Adding to 4244345521 its reverse (1255434424), we get a palindrome (5499779945).

The spelling of 4244345521 in words is "four billion, two hundred forty-four million, three hundred forty-five thousand, five hundred twenty-one".