2001520221 has 16 divisors (see below), whose sum is σ = 2714664960. Its totient is φ = 1311513840.

The previous prime is 2001520201. The next prime is 2001520223. The reversal of 2001520221 is 1220251002.

It is not a de Polignac number, because 2001520221 - 2¹⁰ = 2001519197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2001520221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001520223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33916 + ... + 71786.

It is an arithmetic number, because the mean of its divisors is an integer number (169666560).

Almost surely, 2^2001520221 is an apocalyptic number.

It is an amenable number.

2001520221 is a deficient number, since it is larger than the sum of its proper divisors (713144739).

2001520221 is a wasteful number, since it uses less digits than its factorization.

2001520221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38176.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 2001520221 is about 44738.3529088857. The cubic root of 2001520221 is about 1260.2401954530.

Adding to 2001520221 its reverse (1220251002), we get a palindrome (3221771223).

The spelling of 2001520221 in words is "two billion, one million, five hundred twenty thousand, two hundred twenty-one".