2221504 has 28 divisors (see below), whose sum is σ = 4464304. Its totient is φ = 1096704.

The previous prime is 2221459. The next prime is 2221507. The reversal of 2221504 is 4051222.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221507) 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, 6424 + ... + 6760.

2^2221504 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 2221504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2232152).

2221504 is an abundant number, since it is smaller than the sum of its proper divisors (2242800).

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

2221504 is a wasteful number, since it uses less digits than its factorization.

2221504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452 (or 442 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 2221504 is about 1490.4710664753. The cubic root of 2221504 is about 130.4815277994.

Adding to 2221504 its reverse (4051222), we get a palindrome (6272726).

The spelling of 2221504 in words is "two million, two hundred twenty-one thousand, five hundred four".