2221770 has 32 divisors (see below), whose sum is σ = 5506560. Its totient is φ = 573120.

The previous prime is 2221757. The next prime is 2221771. The reversal of 2221770 is 771222.

2221770 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2221771) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 265 + ... + 2124.

It is an arithmetic number, because the mean of its divisors is an integer number (172080).

2^2221770 is an apocalyptic number.

2221770 is an abundant number, since it is smaller than the sum of its proper divisors (3284790).

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

2221770 is a wasteful number, since it uses less digits than its factorization.

2221770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2430.

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 2221770 is about 1490.5602973379. The cubic root of 2221770 is about 130.4867354877.

Adding to 2221770 its reverse (771222), we get a palindrome (2992992).

The spelling of 2221770 in words is "two million, two hundred twenty-one thousand, seven hundred seventy".