221333442 has 24 divisors (see below), whose sum is σ = 486569328. Its totient is φ = 67070520.

The previous prime is 221333389. The next prime is 221333449. The reversal of 221333442 is 244333122.

221333442 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×221333442³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (221333449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 151708 + ... + 153159.

It is an arithmetic number, because the mean of its divisors is an integer number (20273722).

Almost surely, 2^221333442 is an apocalyptic number.

221333442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221333442 is an abundant number, since it is smaller than the sum of its proper divisors (265235886).

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

221333442 is a wasteful number, since it uses less digits than its factorization.

221333442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304894 (or 304883 counting only the distinct ones).

The product of its digits is 3456, while the sum is 24.

The square root of 221333442 is about 14877.2793883828. The cubic root of 221333442 is about 604.8982749079.

Adding to 221333442 its reverse (244333122), we get a palindrome (465666564).

The spelling of 221333442 in words is "two hundred twenty-one million, three hundred thirty-three thousand, four hundred forty-two".