221331332 has 12 divisors (see below), whose sum is σ = 388804416. Its totient is φ = 110244360.

The previous prime is 221331293. The next prime is 221331337. The reversal of 221331332 is 233133122.

221331332 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221331337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104144 + ... + 106247.

It is an arithmetic number, because the mean of its divisors is an integer number (32400368).

Almost surely, 2^221331332 is an apocalyptic number.

It is an amenable number.

221331332 is a deficient number, since it is larger than the sum of its proper divisors (167473084).

221331332 is a wasteful number, since it uses less digits than its factorization.

221331332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210658 (or 210656 counting only the distinct ones).

The product of its digits is 648, while the sum is 20.

The square root of 221331332 is about 14877.2084747106. The cubic root of 221331332 is about 604.8963527109.

Adding to 221331332 its reverse (233133122), we get a palindrome (454464454).

The spelling of 221331332 in words is "two hundred twenty-one million, three hundred thirty-one thousand, three hundred thirty-two".