5518021 has 2 divisors, whose sum is σ = 5518022. Its totient is φ = 5518020.

The previous prime is 5518001. The next prime is 5518043. The reversal of 5518021 is 1208155.

It is an a-pointer prime, because the next prime (5518043) can be obtained adding 5518021 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4901796 + 616225 = 2214^2 + 785^2 .

It is a cyclic number.

It is not a de Polignac number, because 5518021 - 2⁷ = 5517893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 5517983 and 5518001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5518001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2759010 + 2759011.

It is an arithmetic number, because the mean of its divisors is an integer number (2759011).

Almost surely, 2^5518021 is an apocalyptic number.

It is an amenable number.

5518021 is a deficient number, since it is larger than the sum of its proper divisors (1).

5518021 is an equidigital number, since it uses as much as digits as its factorization.

5518021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 5518021 is about 2349.0468279709. The cubic root of 5518021 is about 176.7099957012.

The spelling of 5518021 in words is "five million, five hundred eighteen thousand, twenty-one".