5511444021 has 6 divisors (see below), whose sum is σ = 7960974710. Its totient is φ = 3674296008.

The previous prime is 5511444017. The next prime is 5511444073. The reversal of 5511444021 is 1204441155.

It can be written as a sum of positive squares in only one way, i.e., 4521083121 + 990360900 = 67239^2 + 31470^2 .

It is not a de Polignac number, because 5511444021 - 2² = 5511444017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5511442021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 306191326 + ... + 306191343.

Almost surely, 2^5511444021 is an apocalyptic number.

It is an amenable number.

5511444021 is a deficient number, since it is larger than the sum of its proper divisors (2449530689).

5511444021 is a wasteful number, since it uses less digits than its factorization.

5511444021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612382675 (or 612382672 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 5511444021 is about 74239.1003514994. The cubic root of 5511444021 is about 1766.3976037650.

Adding to 5511444021 its reverse (1204441155), we get a palindrome (6715885176).

The spelling of 5511444021 in words is "five billion, five hundred eleven million, four hundred forty-four thousand, twenty-one".