2001323232221 has 4 divisors (see below), whose sum is σ = 2119048128252. Its totient is φ = 1883598336192.

The previous prime is 2001323232211. The next prime is 2001323232247. The reversal of 2001323232221 is 1222323231002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1692637428196 + 308685804025 = 1301014^2 + 555595^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001323232221 - 2¹⁸ = 2001322970077 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 (2001323232211) 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, 58862447990 + ... + 58862448023.

It is an arithmetic number, because the mean of its divisors is an integer number (529762032063).

Almost surely, 2^{2001323232221} is an apocalyptic number.

It is an amenable number.

2001323232221 is a deficient number, since it is larger than the sum of its proper divisors (117724896031).

2001323232221 is a wasteful number, since it uses less digits than its factorization.

2001323232221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117724896030.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 2001323232221 its reverse (1222323231002), we get a palindrome (3223646463223).

The spelling of 2001323232221 in words is "two trillion, one billion, three hundred twenty-three million, two hundred thirty-two thousand, two hundred twenty-one".