221123321112 has 64 divisors (see below), whose sum is σ = 568398445920. Its totient is φ = 71633645568.

The previous prime is 221123321101. The next prime is 221123321119. The reversal of 221123321112 is 211123321122.

It is a super-4 number, since 4×221123321112⁴ (a number of 46 digits) contains 4444 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221123321119) 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, 636808 + ... + 920744.

Almost surely, 2^221123321112 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 221123321112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284199222960).

221123321112 is an abundant number, since it is smaller than the sum of its proper divisors (347275124808).

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

221123321112 is a wasteful number, since it uses less digits than its factorization.

221123321112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284860 (or 284856 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

Adding to 221123321112 its reverse (211123321122), we get a palindrome (432246642234).

The spelling of 221123321112 in words is "two hundred twenty-one billion, one hundred twenty-three million, three hundred twenty-one thousand, one hundred twelve".