2181343229 has 4 divisors (see below), whose sum is σ = 2349138876. Its totient is φ = 2013547584.

The previous prime is 2181343193. The next prime is 2181343231. The reversal of 2181343229 is 9223431812.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1113556900 + 1067786329 = 33370^2 + 32677^2 .

It is a cyclic number.

It is not a de Polignac number, because 2181343229 - 2⁸ = 2181342973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181343249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83897804 + ... + 83897829.

It is an arithmetic number, because the mean of its divisors is an integer number (587284719).

Almost surely, 2^2181343229 is an apocalyptic number.

It is an amenable number.

2181343229 is a deficient number, since it is larger than the sum of its proper divisors (167795647).

2181343229 is a wasteful number, since it uses less digits than its factorization.

2181343229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167795646.

The product of its digits is 20736, while the sum is 35.

The square root of 2181343229 is about 46704.8523068000. The cubic root of 2181343229 is about 1296.9045145450.

The spelling of 2181343229 in words is "two billion, one hundred eighty-one million, three hundred forty-three thousand, two hundred twenty-nine".