2001123323221 has 4 divisors (see below), whose sum is σ = 2183043625344. Its totient is φ = 1819203021100.

The previous prime is 2001123323197. The next prime is 2001123323257. The reversal of 2001123323221 is 1223233211002.

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 a cyclic number.

It is not a de Polignac number, because 2001123323221 - 2⁷ = 2001123323093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001123323192 and 2001123323201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001123323821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90960151045 + ... + 90960151066.

It is an arithmetic number, because the mean of its divisors is an integer number (545760906336).

Almost surely, 2^{2001123323221} is an apocalyptic number.

It is an amenable number.

2001123323221 is a deficient number, since it is larger than the sum of its proper divisors (181920302123).

2001123323221 is a wasteful number, since it uses less digits than its factorization.

2001123323221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181920302122.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 2001123323221 its reverse (1223233211002), we get a palindrome (3224356534223).

The spelling of 2001123323221 in words is "two trillion, one billion, one hundred twenty-three million, three hundred twenty-three thousand, two hundred twenty-one".