2001032221 has 4 divisors (see below), whose sum is σ = 2001938652. Its totient is φ = 2000125792.

The previous prime is 2001032213. The next prime is 2001032239. The reversal of 2001032221 is 1222301002.

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 1742144121 + 258888100 = 41739^2 + 16090^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001032221 - 2³ = 2001032213 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 (2001032281) 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, 449896 + ... + 454321.

It is an arithmetic number, because the mean of its divisors is an integer number (500484663).

Almost surely, 2^2001032221 is an apocalyptic number.

It is an amenable number.

2001032221 is a deficient number, since it is larger than the sum of its proper divisors (906431).

2001032221 is an equidigital number, since it uses as much as digits as its factorization.

2001032221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906430.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 2001032221 is about 44732.8986429451. The cubic root of 2001032221 is about 1260.1377654438.

Adding to 2001032221 its reverse (1222301002), we get a palindrome (3223333223).

The spelling of 2001032221 in words is "two billion, one million, thirty-two thousand, two hundred twenty-one".