2200921 has 4 divisors (see below), whose sum is σ = 2254644. Its totient is φ = 2147200.

The previous prime is 2200909. The next prime is 2200943. The reversal of 2200921 is 1290022.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1290022 = 2 ⋅645011.

It can be written as a sum of positive squares in 2 ways, for example, as 416025 + 1784896 = 645^2 + 1336^2 .

It is a cyclic number.

It is not a de Polignac number, because 2200921 - 2⁵ = 2200889 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2200895 and 2200904.

It is not an unprimeable number, because it can be changed into a prime (2200981) 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, 26800 + ... + 26881.

It is an arithmetic number, because the mean of its divisors is an integer number (563661).

2^2200921 is an apocalyptic number.

It is an amenable number.

2200921 is a deficient number, since it is larger than the sum of its proper divisors (53723).

2200921 is an equidigital number, since it uses as much as digits as its factorization.

2200921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53722.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2200921 is about 1483.5501339692. The cubic root of 2200921 is about 130.0772913156.

Adding to 2200921 its reverse (1290022), we get a palindrome (3490943).

The spelling of 2200921 in words is "two million, two hundred thousand, nine hundred twenty-one".