2221656 has 16 divisors (see below), whose sum is σ = 5554200. Its totient is φ = 740544.

The previous prime is 2221633. The next prime is 2221657. The reversal of 2221656 is 6561222.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 92569 = 2221656 / (2 + 2 + 2 + 1 + 6 + 5 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221657) 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, 46261 + ... + 46308.

2^2221656 is an apocalyptic number.

It is an amenable number.

2221656 is an abundant number, since it is smaller than the sum of its proper divisors (3332544).

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

2221656 is a wasteful number, since it uses less digits than its factorization.

2221656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92578 (or 92574 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 2221656 is about 1490.5220561937. The cubic root of 2221656 is about 130.4845036722.

Adding to 2221656 its reverse (6561222), we get a palindrome (8782878).

The spelling of 2221656 in words is "two million, two hundred twenty-one thousand, six hundred fifty-six".