2721204 has 36 divisors (see below), whose sum is σ = 6928740. Its totient is φ = 900480.

The previous prime is 2721197. The next prime is 2721223. The reversal of 2721204 is 4021272.

It can be written as a sum of positive squares in 2 ways, for example, as 898704 + 1822500 = 948^2 + 1350^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9544 + ... + 9824.

It is an arithmetic number, because the mean of its divisors is an integer number (192465).

2^2721204 is an apocalyptic number.

It is an amenable number.

2721204 is an abundant number, since it is smaller than the sum of its proper divisors (4207536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2721204 is a wasteful number, since it uses less digits than its factorization.

2721204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560 (or 555 counting only the distinct ones).

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

The square root of 2721204 is about 1649.6072259784. The cubic root of 2721204 is about 139.6112343622.

Adding to 2721204 its reverse (4021272), we get a palindrome (6742476).

The spelling of 2721204 in words is "two million, seven hundred twenty-one thousand, two hundred four".