22001312 has 12 divisors (see below), whose sum is σ = 43315146. Its totient is φ = 11000640.

The previous prime is 22001303. The next prime is 22001321. The reversal of 22001312 is 21310022.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22001303) and next prime (22001321).

It can be written as a sum of positive squares in only one way, i.e., 19324816 + 2676496 = 4396^2 + 1636^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22001293 and 22001302.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343739 + ... + 343802.

Almost surely, 2^22001312 is an apocalyptic number.

It is an amenable number.

22001312 is a deficient number, since it is larger than the sum of its proper divisors (21313834).

22001312 is an equidigital number, since it uses as much as digits as its factorization.

22001312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687551 (or 687543 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 22001312 is about 4690.5556174082. Note that the first 3 decimals coincide. The cubic root of 22001312 is about 280.2095030694.

Adding to 22001312 its reverse (21310022), we get a palindrome (43311334).

The spelling of 22001312 in words is "twenty-two million, one thousand, three hundred twelve".