2001320221 has 8 divisors (see below), whose sum is σ = 2009944440. Its totient is φ = 1992711168.

The previous prime is 2001320219. The next prime is 2001320231. The reversal of 2001320221 is 1220231002.

It can be written as a sum of positive squares in 4 ways, for example, as 251571321 + 1749748900 = 15861^2 + 41830^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2001320221 - 2¹ = 2001320219 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 (2001320231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316725 + ... + 322981.

It is an arithmetic number, because the mean of its divisors is an integer number (251243055).

Almost surely, 2^2001320221 is an apocalyptic number.

It is an amenable number.

2001320221 is a deficient number, since it is larger than the sum of its proper divisors (8624219).

2001320221 is a wasteful number, since it uses less digits than its factorization.

2001320221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7583.

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

The square root of 2001320221 is about 44736.1176344126. The cubic root of 2001320221 is about 1260.1982179547.

Adding to 2001320221 its reverse (1220231002), we get a palindrome (3221551223).

The spelling of 2001320221 in words is "two billion, one million, three hundred twenty thousand, two hundred twenty-one".