221233012 has 72 divisors (see below), whose sum is σ = 523862528. Its totient is φ = 79548480.

The previous prime is 221233009. The next prime is 221233057. The reversal of 221233012 is 210332122.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41533 + ... + 46555.

Almost surely, 2^221233012 is an apocalyptic number.

221233012 is a gapful number since it is divisible by the number (22) 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 221233012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261931264).

221233012 is an abundant number, since it is smaller than the sum of its proper divisors (302629516).

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

221233012 is a wasteful number, since it uses less digits than its factorization.

221233012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5069 (or 5056 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 221233012 is about 14873.9037243086. The cubic root of 221233012 is about 604.8067702472.

Adding to 221233012 its reverse (210332122), we get a palindrome (431565134).

The spelling of 221233012 in words is "two hundred twenty-one million, two hundred thirty-three thousand, twelve".