220221000 has 96 divisors (see below), whose sum is σ = 744377400. Its totient is φ = 58723200.

The previous prime is 220220999. The next prime is 220221007. The reversal of 220221000 is 122022.

It can be written as a sum of positive squares in 4 ways, for example, as 29615364 + 190605636 = 5442^2 + 13806^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (220221007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3235 + ... + 21234.

Almost surely, 2^220221000 is an apocalyptic number.

220221000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 220221000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (372188700).

220221000 is an abundant number, since it is smaller than the sum of its proper divisors (524156400).

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

220221000 is a wasteful number, since it uses less digits than its factorization.

220221000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24496 (or 24479 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 220221000 is about 14839.8450126678. The cubic root of 220221000 is about 603.8831477235.

Adding to 220221000 its reverse (122022), we get a palindrome (220343022).

The spelling of 220221000 in words is "two hundred twenty million, two hundred twenty-one thousand".