2181355 has 16 divisors (see below), whose sum is σ = 3024864. Its totient is φ = 1492480.

The previous prime is 2181349. The next prime is 2181359. The reversal of 2181355 is 5531812.

It is a happy number.

It is not a de Polignac number, because 2181355 - 2⁷ = 2181227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2181359) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232 + ... + 2101.

It is an arithmetic number, because the mean of its divisors is an integer number (189054).

2^2181355 is an apocalyptic number.

2181355 is a deficient number, since it is larger than the sum of its proper divisors (843509).

2181355 is a wasteful number, since it uses less digits than its factorization.

2181355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2366.

The product of its digits is 1200, while the sum is 25.

The square root of 2181355 is about 1476.9410956433. The cubic root of 2181355 is about 129.6906847333.

The spelling of 2181355 in words is "two million, one hundred eighty-one thousand, three hundred fifty-five".