2001221 has 8 divisors (see below), whose sum is σ = 2060640. Its totient is φ = 1942768.

The previous prime is 2001211. The next prime is 2001229. The reversal of 2001221 is 1221002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001221 is a prime.

It is a Duffinian number.

2001221 is a modest number, since divided by 1221 gives 2 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 2001199 and 2001208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001229) 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, 6155 + ... + 6471.

It is an arithmetic number, because the mean of its divisors is an integer number (257580).

2^2001221 is an apocalyptic number.

It is an amenable number.

2001221 is a deficient number, since it is larger than the sum of its proper divisors (59419).

2001221 is a wasteful number, since it uses less digits than its factorization.

2001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 2001221 is about 1414.6451851966. The cubic root of 2001221 is about 126.0177391670.

Adding to 2001221 its reverse (1221002), we get a palindrome (3222223).

It can be divided in two parts, 2001 and 221, that added together give a palindrome (2222).

The spelling of 2001221 in words is "two million, one thousand, two hundred twenty-one".