2221223646 has 16 divisors (see below), whose sum is σ = 4448884608. Its totient is φ = 739335000.

The previous prime is 2221223603. The next prime is 2221223647. The reversal of 2221223646 is 6463221222.

2221223646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221223647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 263730 + ... + 272021.

It is an arithmetic number, because the mean of its divisors is an integer number (278055288).

Almost surely, 2^2221223646 is an apocalyptic number.

2221223646 is an abundant number, since it is smaller than the sum of its proper divisors (2227660962).

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

2221223646 is a wasteful number, since it uses less digits than its factorization.

2221223646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536447.

The product of its digits is 13824, while the sum is 30.

The square root of 2221223646 is about 47129.8593887145. The cubic root of 2221223646 is about 1304.7603864174.

Adding to 2221223646 its reverse (6463221222), we get a palindrome (8684444868).

The spelling of 2221223646 in words is "two billion, two hundred twenty-one million, two hundred twenty-three thousand, six hundred forty-six".