221223012 has 24 divisors (see below), whose sum is σ = 523893216. Its totient is φ = 72640128.

The previous prime is 221223001. The next prime is 221223029. The reversal of 221223012 is 210322122.

It is a happy number.

221223012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221222982 and 221223000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136773 + ... + 138380.

It is an arithmetic number, because the mean of its divisors is an integer number (21828884).

Almost surely, 2^221223012 is an apocalyptic number.

It is an amenable number.

221223012 is an abundant number, since it is smaller than the sum of its proper divisors (302670204).

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

221223012 is a wasteful number, since it uses less digits than its factorization.

221223012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275227 (or 275225 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 221223012 is about 14873.5675612813. The cubic root of 221223012 is about 604.7976574438.

Adding to 221223012 its reverse (210322122), we get a palindrome (431545134).

The spelling of 221223012 in words is "two hundred twenty-one million, two hundred twenty-three thousand, twelve".