220221312 has 32 divisors (see below), whose sum is σ = 584963880. Its totient is φ = 73406976.

The previous prime is 220221233. The next prime is 220221341. The reversal of 220221312 is 213122022.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 220221291 and 220221300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 286363 + ... + 287130.

Almost surely, 2^220221312 is an apocalyptic number.

It is an amenable number.

220221312 is an abundant number, since it is smaller than the sum of its proper divisors (364742568).

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

220221312 is an equidigital number, since it uses as much as digits as its factorization.

220221312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573510 (or 573498 counting only the distinct ones).

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

The square root of 220221312 is about 14839.8555249032. The cubic root of 220221312 is about 603.8834329089.

Adding to 220221312 its reverse (213122022), we get a palindrome (433343334).

The spelling of 220221312 in words is "two hundred twenty million, two hundred twenty-one thousand, three hundred twelve".