2221312 has 18 divisors (see below), whose sum is σ = 4434458. Its totient is φ = 1110528.

The previous prime is 2221301. The next prime is 2221321. The reversal of 2221312 is 2131222.

It can be written as a sum of positive squares in only one way, i.e., 1679616 + 541696 = 1296^2 + 736^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2221292 and 2221301.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4083 + ... + 4594.

2^2221312 is an apocalyptic number.

It is an amenable number.

2221312 is a deficient number, since it is larger than the sum of its proper divisors (2213146).

2221312 is an frugal number, since it uses more digits than its factorization.

2221312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8693 (or 8679 counting only the distinct ones).

The product of its digits is 48, while the sum is 13.

The square root of 2221312 is about 1490.4066559164. The cubic root of 2221312 is about 130.4777686082.

Adding to 2221312 its reverse (2131222), we get a palindrome (4352534).

It can be divided in two parts, 22 and 21312, that multiplied together give a palindrome (468864).

The spelling of 2221312 in words is "two million, two hundred twenty-one thousand, three hundred twelve".