2001222312 has 64 divisors (see below), whose sum is σ = 5106892800. Its totient is φ = 653365440.

The previous prime is 2001222277. The next prime is 2001222317. The reversal of 2001222312 is 2132221002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2001222291 and 2001222300.

It is not an unprimeable number, because it can be changed into a prime (2001222317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236637 + ... + 244947.

It is an arithmetic number, because the mean of its divisors is an integer number (79795200).

Almost surely, 2^2001222312 is an apocalyptic number.

It is an amenable number.

2001222312 is an abundant number, since it is smaller than the sum of its proper divisors (3105670488).

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

2001222312 is a wasteful number, since it uses less digits than its factorization.

2001222312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8526 (or 8522 counting only the distinct ones).

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

The square root of 2001222312 is about 44735.0233262485. The cubic root of 2001222312 is about 1260.1776670607.

Adding to 2001222312 its reverse (2132221002), we get a palindrome (4133443314).

It can be divided in two parts, 20012 and 22312, that added together give a palindrome (42324).

The spelling of 2001222312 in words is "two billion, one million, two hundred twenty-two thousand, three hundred twelve".