2721155 has 12 divisors (see below), whose sum is σ = 3347040. Its totient is φ = 2123472.

The previous prime is 2721143. The next prime is 2721163. The reversal of 2721155 is 5511272.

It is a happy number.

It is not a de Polignac number, because 2721155 - 2⁸ = 2720899 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2721155.

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, 32744 + ... + 32826.

It is an arithmetic number, because the mean of its divisors is an integer number (278920).

2^2721155 is an apocalyptic number.

2721155 is a deficient number, since it is larger than the sum of its proper divisors (625885).

2721155 is an frugal number, since it uses more digits than its factorization.

2721155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250 (or 167 counting only the distinct ones).

The product of its digits is 700, while the sum is 23.

The square root of 2721155 is about 1649.5923738912. The cubic root of 2721155 is about 139.6103963763.

The spelling of 2721155 in words is "two million, seven hundred twenty-one thousand, one hundred fifty-five".