221320203312 has 160 divisors (see below), whose sum is σ = 630319656960. Its totient is φ = 66491182080.

The previous prime is 221320203289. The next prime is 221320203323. The reversal of 221320203312 is 213302023122.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12631614 + ... + 12649122.

It is an arithmetic number, because the mean of its divisors is an integer number (3939497856).

Almost surely, 2^221320203312 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 221320203312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (315159828480).

221320203312 is an abundant number, since it is smaller than the sum of its proper divisors (408999453648).

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

221320203312 is a wasteful number, since it uses less digits than its factorization.

221320203312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18011 (or 18005 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 221320203312 its reverse (213302023122), we get a palindrome (434622226434).

The spelling of 221320203312 in words is "two hundred twenty-one billion, three hundred twenty million, two hundred three thousand, three hundred twelve".