221123340 has 72 divisors (see below), whose sum is σ = 677437488. Its totient is φ = 58377600.

The previous prime is 221123339. The next prime is 221123363. The reversal of 221123340 is 43321122.

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

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, 12099 + ... + 24261.

It is an arithmetic number, because the mean of its divisors is an integer number (9408854).

Almost surely, 2^221123340 is an apocalyptic number.

221123340 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 221123340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (338718744).

221123340 is an abundant number, since it is smaller than the sum of its proper divisors (456314148).

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

221123340 is a wasteful number, since it uses less digits than its factorization.

221123340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12279 (or 12274 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 221123340 is about 14870.2165417992. The cubic root of 221123340 is about 604.7068132966.

Adding to 221123340 its reverse (43321122), we get a palindrome (264444462).

It can be divided in two parts, 22112 and 3340, that added together give a palindrome (25452).

The spelling of 221123340 in words is "two hundred twenty-one million, one hundred twenty-three thousand, three hundred forty".