2181333 has 48 divisors (see below), whose sum is σ = 3939840. Its totient is φ = 1058400.

The previous prime is 2181331. The next prime is 2181337. The reversal of 2181333 is 3331812.

It is a happy number.

It is not a de Polignac number, because 2181333 - 2¹ = 2181331 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181331) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30688 + ... + 30758.

It is an arithmetic number, because the mean of its divisors is an integer number (82080).

2^2181333 is an apocalyptic number.

It is an amenable number.

2181333 is a deficient number, since it is larger than the sum of its proper divisors (1758507).

2181333 is a wasteful number, since it uses less digits than its factorization.

2181333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118 (or 111 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

The square root of 2181333 is about 1476.9336477987. The cubic root of 2181333 is about 129.6902487345.

It can be divided in two parts, 218 and 1333, that added together give a palindrome (1551).

The spelling of 2181333 in words is "two million, one hundred eighty-one thousand, three hundred thirty-three".