221311213320 has 64 divisors (see below), whose sum is σ = 664617752640. Its totient is φ = 58955513600.

The previous prime is 221311213313. The next prime is 221311213399. The reversal of 221311213320 is 23312113122.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 833151 + ... + 1066190.

It is an arithmetic number, because the mean of its divisors is an integer number (10384652385).

Almost surely, 2^221311213320 is an apocalyptic number.

221311213320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221311213320 is an abundant number, since it is smaller than the sum of its proper divisors (443306539320).

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

221311213320 is a wasteful number, since it uses less digits than its factorization.

221311213320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1900326 (or 1900322 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 221311213320 its reverse (23312113122), we get a palindrome (244623326442).

The spelling of 221311213320 in words is "two hundred twenty-one billion, three hundred eleven million, two hundred thirteen thousand, three hundred twenty".