221323111320 has 128 divisors (see below), whose sum is σ = 680265008640. Its totient is φ = 57588142080.

The previous prime is 221323111301. The next prime is 221323111349. The reversal of 221323111320 is 23111323122.

It is a super-2 number, since 2×221323111320² (a number of 23 digits) contains 22 as substring.

It is a congruent 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, 692539 + ... + 960341.

It is an arithmetic number, because the mean of its divisors is an integer number (5314570380).

Almost surely, 2^221323111320 is an apocalyptic number.

221323111320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221323111320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (340132504320).

221323111320 is an abundant number, since it is smaller than the sum of its proper divisors (458941897320).

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

221323111320 is a wasteful number, since it uses less digits than its factorization.

221323111320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267985 (or 267981 counting only the distinct ones).

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

Adding to 221323111320 its reverse (23111323122), we get a palindrome (244434434442).

The spelling of 221323111320 in words is "two hundred twenty-one billion, three hundred twenty-three million, one hundred eleven thousand, three hundred twenty".