2001223101 has 4 divisors (see below), whose sum is σ = 2668297472. Its totient is φ = 1334148732.

The previous prime is 2001223069. The next prime is 2001223129. The reversal of 2001223101 is 1013221002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2001223101 - 2⁵ = 2001223069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001223151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333537181 + ... + 333537186.

It is an arithmetic number, because the mean of its divisors is an integer number (667074368).

Almost surely, 2^2001223101 is an apocalyptic number.

It is an amenable number.

2001223101 is a deficient number, since it is larger than the sum of its proper divisors (667074371).

2001223101 is an equidigital number, since it uses as much as digits as its factorization.

2001223101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667074370.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 2001223101 is about 44735.0321448415. The cubic root of 2001223101 is about 1260.1778326728.

Adding to 2001223101 its reverse (1013221002), we get a palindrome (3014444103).

The spelling of 2001223101 in words is "two billion, one million, two hundred twenty-three thousand, one hundred one".