2221555 has 8 divisors (see below), whose sum is σ = 3046752. Its totient is φ = 1523328.

The previous prime is 2221523. The next prime is 2221567. The reversal of 2221555 is 5551222.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2221555 - 2⁵ = 2221523 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31702 + ... + 31771.

It is an arithmetic number, because the mean of its divisors is an integer number (380844).

2^2221555 is an apocalyptic number.

2221555 is a deficient number, since it is larger than the sum of its proper divisors (825197).

2221555 is an equidigital number, since it uses as much as digits as its factorization.

2221555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63485.

The product of its digits is 1000, while the sum is 22.

The square root of 2221555 is about 1490.4881750621. The cubic root of 2221555 is about 130.4825262982.

Adding to 2221555 its reverse (5551222), we get a palindrome (7772777).

The spelling of 2221555 in words is "two million, two hundred twenty-one thousand, five hundred fifty-five".