221140220 has 48 divisors (see below), whose sum is σ = 537159168. Its totient is φ = 74902080.

The previous prime is 221140187. The next prime is 221140223. The reversal of 221140220 is 22041122.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 221140195 and 221140204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221140223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2105 + ... + 21135.

It is an arithmetic number, because the mean of its divisors is an integer number (11190816).

Almost surely, 2^221140220 is an apocalyptic number.

221140220 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 221140220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268579584).

221140220 is an abundant number, since it is smaller than the sum of its proper divisors (316018948).

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

221140220 is a wasteful number, since it uses less digits than its factorization.

221140220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19130 (or 19128 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 221140220 is about 14870.7841084457. The cubic root of 221140220 is about 604.7222001711.

Adding to 221140220 its reverse (22041122), we get a palindrome (243181342).

The spelling of 221140220 in words is "two hundred twenty-one million, one hundred forty thousand, two hundred twenty".