2001223100 has 36 divisors (see below), whose sum is σ = 4531470384. Its totient is φ = 765684480.

The previous prime is 2001223069. The next prime is 2001223129. The reversal of 2001223100 is 13221002.

It is a happy number.

It is a super-2 number, since 2×2001223100² = 8009787791947220000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 432749 + ... + 437348.

Almost surely, 2^2001223100 is an apocalyptic number.

2001223100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001223100 is an abundant number, since it is smaller than the sum of its proper divisors (2530247284).

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

2001223100 is a wasteful number, since it uses less digits than its factorization.

2001223100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870134 (or 870127 counting only the distinct ones).

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

The square root of 2001223100 is about 44735.0321336646. The cubic root of 2001223100 is about 1260.1778324629.

Adding to 2001223100 its reverse (13221002), we get a palindrome (2014444102).

The spelling of 2001223100 in words is "two billion, one million, two hundred twenty-three thousand, one hundred".