2204721 has 12 divisors (see below), whose sum is σ = 3203200. Its totient is φ = 1461240.

The previous prime is 2204701. The next prime is 2204731. The reversal of 2204721 is 1274022.

It is not a de Polignac number, because 2204721 - 2¹³ = 2196529 is a prime.

It is a Duffinian number.

2204721 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2204694 and 2204703.

It is not an unprimeable number, because it can be changed into a prime (2204701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1176 + ... + 2406.

2^2204721 is an apocalyptic number.

It is an amenable number.

2204721 is a deficient number, since it is larger than the sum of its proper divisors (998479).

2204721 is a wasteful number, since it uses less digits than its factorization.

2204721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436 (or 1433 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 2204721 is about 1484.8302933332. The cubic root of 2204721 is about 130.1521099188.

Adding to 2204721 its reverse (1274022), we get a palindrome (3478743).

The spelling of 2204721 in words is "two million, two hundred four thousand, seven hundred twenty-one".