221331233312 has 96 divisors (see below), whose sum is σ = 510190192512. Its totient is φ = 92538722304.

The previous prime is 221331233311. The next prime is 221331233329. The reversal of 221331233312 is 213332133122.

It is not an unprimeable number, because it can be changed into a prime (221331233311) 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, 8241218 + ... + 8268030.

It is an arithmetic number, because the mean of its divisors is an integer number (5314481172).

Almost surely, 2^221331233312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221331233312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255095096256).

221331233312 is an abundant number, since it is smaller than the sum of its proper divisors (288858959200).

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

221331233312 is a wasteful number, since it uses less digits than its factorization.

221331233312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27730 (or 27722 counting only the distinct ones).

The product of its digits is 3888, while the sum is 26.

Adding to 221331233312 its reverse (213332133122), we get a palindrome (434663366434).

The spelling of 221331233312 in words is "two hundred twenty-one billion, three hundred thirty-one million, two hundred thirty-three thousand, three hundred twelve".