2001222320 has 40 divisors (see below), whose sum is σ = 4926541824. Its totient is φ = 753400832.

The previous prime is 2001222317. The next prime is 2001222361. The reversal of 2001222320 is 232221002.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 2001222295 and 2001222304.

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, 734384 + ... + 737103.

Almost surely, 2^2001222320 is an apocalyptic number.

2001222320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001222320 is an abundant number, since it is smaller than the sum of its proper divisors (2925319504).

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

2001222320 is a wasteful number, since it uses less digits than its factorization.

2001222320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1471517 (or 1471511 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 2001222320 is about 44735.0234156639. The cubic root of 2001222320 is about 1260.1776687399.

Adding to 2001222320 its reverse (232221002), we get a palindrome (2233443322).

The spelling of 2001222320 in words is "two billion, one million, two hundred twenty-two thousand, three hundred twenty".