2181343228 has 12 divisors (see below), whose sum is σ = 3948983640. Its totient is φ = 1053062192.

The previous prime is 2181343193. The next prime is 2181343231. The reversal of 2181343228 is 8223431812.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2181343193 and 2181343202.

It is a congruent number.

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, 9402226 + ... + 9402457.

It is an arithmetic number, because the mean of its divisors is an integer number (329081970).

Almost surely, 2^2181343228 is an apocalyptic number.

It is an amenable number.

2181343228 is a deficient number, since it is larger than the sum of its proper divisors (1767640412).

2181343228 is a wasteful number, since it uses less digits than its factorization.

2181343228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18804716 (or 18804714 counting only the distinct ones).

The product of its digits is 18432, while the sum is 34.

The square root of 2181343228 is about 46704.8522960945. The cubic root of 2181343228 is about 1296.9045143468.

The spelling of 2181343228 in words is "two billion, one hundred eighty-one million, three hundred forty-three thousand, two hundred twenty-eight".