221516873 has 4 divisors (see below), whose sum is σ = 222566928. Its totient is φ = 220466820.

The previous prime is 221516833. The next prime is 221516879. The reversal of 221516873 is 378615122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221516873 - 2¹⁰ = 221515849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221516879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 524711 + ... + 525132.

It is an arithmetic number, because the mean of its divisors is an integer number (55641732).

Almost surely, 2^221516873 is an apocalyptic number.

It is an amenable number.

221516873 is a deficient number, since it is larger than the sum of its proper divisors (1050055).

221516873 is a wasteful number, since it uses less digits than its factorization.

221516873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050054.

The product of its digits is 20160, while the sum is 35.

The square root of 221516873 is about 14883.4429148635. The cubic root of 221516873 is about 605.0653327438.

The spelling of 221516873 in words is "two hundred twenty-one million, five hundred sixteen thousand, eight hundred seventy-three".