2221164 has 72 divisors (see below), whose sum is σ = 6289920. Its totient is φ = 655200.

The previous prime is 2221159. The next prime is 2221183. The reversal of 2221164 is 4611222.

2221164 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28077 + ... + 28155.

It is an arithmetic number, because the mean of its divisors is an integer number (87360).

2^2221164 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 2221164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3144960).

2221164 is an abundant number, since it is smaller than the sum of its proper divisors (4068756).

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

2221164 is a wasteful number, since it uses less digits than its factorization.

2221164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171 (or 166 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 2221164 is about 1490.3570042107. The cubic root of 2221164 is about 130.4748707504.

Adding to 2221164 its reverse (4611222), we get a palindrome (6832386).

The spelling of 2221164 in words is "two million, two hundred twenty-one thousand, one hundred sixty-four".