2181222473 has 8 divisors (see below), whose sum is σ = 2237301000. Its totient is φ = 2125696768.

The previous prime is 2181222467. The next prime is 2181222517. The reversal of 2181222473 is 3742221812.

It can be written as a sum of positive squares in 4 ways, for example, as 8543929 + 2172678544 = 2923^2 + 46612^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2181222473 - 2¹⁶ = 2181156937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2187222473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130208 + ... + 146001.

It is an arithmetic number, because the mean of its divisors is an integer number (279662625).

Almost surely, 2^2181222473 is an apocalyptic number.

It is an amenable number.

2181222473 is a deficient number, since it is larger than the sum of its proper divisors (56078527).

2181222473 is a wasteful number, since it uses less digits than its factorization.

2181222473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276411.

The product of its digits is 10752, while the sum is 32.

The square root of 2181222473 is about 46703.5595324382. The cubic root of 2181222473 is about 1296.8805825186.

The spelling of 2181222473 in words is "two billion, one hundred eighty-one million, two hundred twenty-two thousand, four hundred seventy-three".