2181840226 has 4 divisors (see below), whose sum is σ = 3272760342. Its totient is φ = 1090920112.

The previous prime is 2181840211. The next prime is 2181840263. The reversal of 2181840226 is 6220481812.

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

It can be written as a sum of positive squares in only one way, i.e., 2169230625 + 12609601 = 46575^2 + 3551^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2181840191 and 2181840200.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545460055 + ... + 545460058.

Almost surely, 2^2181840226 is an apocalyptic number.

2181840226 is a deficient number, since it is larger than the sum of its proper divisors (1090920116).

2181840226 is a wasteful number, since it uses less digits than its factorization.

2181840226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090920115.

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 2181840226 is about 46710.1726179641. The cubic root of 2181840226 is about 1297.0030025926.

The spelling of 2181840226 in words is "two billion, one hundred eighty-one million, eight hundred forty thousand, two hundred twenty-six".