221902673 has 8 divisors (see below), whose sum is σ = 223278120. Its totient is φ = 220531840.

The previous prime is 221902633. The next prime is 221902739. The reversal of 221902673 is 376209122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4870849 + 217031824 = 2207^2 + 14732^2 .

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 221902673 - 2²² = 217708369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221902633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149093 + ... + 150573.

It is an arithmetic number, because the mean of its divisors is an integer number (27909765).

Almost surely, 2^221902673 is an apocalyptic number.

It is an amenable number.

221902673 is a deficient number, since it is larger than the sum of its proper divisors (1375447).

221902673 is a wasteful number, since it uses less digits than its factorization.

221902673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2307.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 221902673 is about 14896.3979874331. The cubic root of 221902673 is about 605.4163952681.

The spelling of 221902673 in words is "two hundred twenty-one million, nine hundred two thousand, six hundred seventy-three".