2201021 has 4 divisors (see below), whose sum is σ = 2207712. Its totient is φ = 2194332.

The previous prime is 2200997. The next prime is 2201033. The reversal of 2201021 is 1201022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2201021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2201051) 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, 2825 + ... + 3518.

It is an arithmetic number, because the mean of its divisors is an integer number (551928).

2^2201021 is an apocalyptic number.

It is an amenable number.

2201021 is a deficient number, since it is larger than the sum of its proper divisors (6691).

2201021 is an equidigital number, since it uses as much as digits as its factorization.

2201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6690.

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

The square root of 2201021 is about 1483.5838365256. The cubic root of 2201021 is about 130.0792613290.

Adding to 2201021 its reverse (1201022), we get a palindrome (3402043).

Subtracting from 2201021 its reverse (1201022), we obtain a palindrome (999999).

The spelling of 2201021 in words is "two million, two hundred one thousand, twenty-one".