2097221 has 4 divisors (see below), whose sum is σ = 2396832. Its totient is φ = 1797612.

The previous prime is 2097211. The next prime is 2097223. The reversal of 2097221 is 1227902.

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-2097221 is a prime.

It is a d-powerful number, because it can be written as 2 + 0 + 9 + 7² + 2³ + 2²¹ + 1 .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2097223) 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, 149795 + ... + 149808.

It is an arithmetic number, because the mean of its divisors is an integer number (599208).

2^2097221 is an apocalyptic number.

It is an amenable number.

2097221 is a deficient number, since it is larger than the sum of its proper divisors (299611).

2097221 is an equidigital number, since it uses as much as digits as its factorization.

2097221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299610.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 2097221 is about 1448.1785110959. The cubic root of 2097221 is about 128.0014037932.

The spelling of 2097221 in words is "two million, ninety-seven thousand, two hundred twenty-one".