2181241828 has 12 divisors (see below), whose sum is σ = 3819319420. Its totient is φ = 1090007712.

The previous prime is 2181241817. The next prime is 2181241841. The reversal of 2181241828 is 8281421812.

It can be written as a sum of positive squares in 2 ways, for example, as 1390394944 + 790846884 = 37288^2 + 28122^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145251 + ... + 159562.

Almost surely, 2^2181241828 is an apocalyptic number.

It is an amenable number.

2181241828 is a deficient number, since it is larger than the sum of its proper divisors (1638077592).

2181241828 is a wasteful number, since it uses less digits than its factorization.

2181241828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306606 (or 306604 counting only the distinct ones).

The product of its digits is 16384, while the sum is 37.

The square root of 2181241828 is about 46703.7667431654. The cubic root of 2181241828 is about 1296.8844184485.

The spelling of 2181241828 in words is "two billion, one hundred eighty-one million, two hundred forty-one thousand, eight hundred twenty-eight".