221200111312 has 80 divisors (see below), whose sum is σ = 452772092160. Its totient is φ = 104480640000.

The previous prime is 221200111277. The next prime is 221200111397. The reversal of 221200111312 is 213111002122.

It is a super-2 number, since 2×221200111312² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15194437 + ... + 15208987.

It is an arithmetic number, because the mean of its divisors is an integer number (5659651152).

Almost surely, 2^221200111312 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 221200111312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226386046080).

221200111312 is an abundant number, since it is smaller than the sum of its proper divisors (231571980848).

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

221200111312 is a wasteful number, since it uses less digits than its factorization.

221200111312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15092 (or 15086 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 221200111312 its reverse (213111002122), we get a palindrome (434311113434).

The spelling of 221200111312 in words is "two hundred twenty-one billion, two hundred million, one hundred eleven thousand, three hundred twelve".