2181235 has 24 divisors (see below), whose sum is σ = 3160080. Its totient is φ = 1439424.

The previous prime is 2181233. The next prime is 2181247. The reversal of 2181235 is 5321812.

It is not a de Polignac number, because 2181235 - 2¹ = 2181233 is a prime.

It is a super-2 number, since 2×2181235² = 9515572250450, which contains 22 as substring.

2181235 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2181233) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6952 + ... + 7258.

It is an arithmetic number, because the mean of its divisors is an integer number (131670).

2^2181235 is an apocalyptic number.

2181235 is a deficient number, since it is larger than the sum of its proper divisors (978845).

2181235 is a wasteful number, since it uses less digits than its factorization.

2181235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355 (or 348 counting only the distinct ones).

The product of its digits is 480, while the sum is 22.

The square root of 2181235 is about 1476.9004705802. The cubic root of 2181235 is about 129.6883065223.

The spelling of 2181235 in words is "two million, one hundred eighty-one thousand, two hundred thirty-five".