3550221 has 12 divisors (see below), whose sum is σ = 5153148. Its totient is φ = 2355264.

The previous prime is 3550219. The next prime is 3550249. The reversal of 3550221 is 1220553.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1022121 + 2528100 = 1011^2 + 1590^2 .

It is not a de Polignac number, because 3550221 - 2¹ = 3550219 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 3550194 and 3550203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3550201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1251 + ... + 2943.

It is an arithmetic number, because the mean of its divisors is an integer number (429429).

Almost surely, 2^3550221 is an apocalyptic number.

It is an amenable number.

3550221 is a deficient number, since it is larger than the sum of its proper divisors (1602927).

3550221 is a wasteful number, since it uses less digits than its factorization.

3550221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1932 (or 1929 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 3550221 is about 1884.2030145396. The cubic root of 3550221 is about 152.5521956958.

Adding to 3550221 its reverse (1220553), we get a palindrome (4770774).

The spelling of 3550221 in words is "three million, five hundred fifty thousand, two hundred twenty-one".