2221544 has 32 divisors (see below), whose sum is σ = 4604040. Its totient is φ = 998400.

The previous prime is 2221523. The next prime is 2221567. The reversal of 2221544 is 4451222.

It is a happy number.

2221544 is digitally balanced in base 2 and base 5, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 688900 + 1532644 = 830^2 + 1238^2 .

It is a d-powerful number, because it can be written as 2 + 2⁷ + 2¹¹ + 1 + 5⁹ + 4⁶ + 4⁹ .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4004 + ... + 4524.

2^2221544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2221544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2302020).

2221544 is an abundant number, since it is smaller than the sum of its proper divisors (2382496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2221544 is a wasteful number, since it uses less digits than its factorization.

2221544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581 (or 577 counting only the distinct ones).

The product of its digits is 640, while the sum is 20.

The square root of 2221544 is about 1490.4844849914. The cubic root of 2221544 is about 130.4823109370.

Adding to 2221544 its reverse (4451222), we get a palindrome (6672766).

The spelling of 2221544 in words is "two million, two hundred twenty-one thousand, five hundred forty-four".