221672213 has 8 divisors (see below), whose sum is σ = 255582528. Its totient is φ = 188322624.

The previous prime is 221672177. The next prime is 221672219. The reversal of 221672213 is 312276122.

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

It is not a de Polignac number, because 221672213 - 2¹⁴ = 221655829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221672219) 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, 139331 + ... + 140912.

It is an arithmetic number, because the mean of its divisors is an integer number (31947816).

Almost surely, 2^221672213 is an apocalyptic number.

It is an amenable number.

221672213 is a deficient number, since it is larger than the sum of its proper divisors (33910315).

221672213 is a wasteful number, since it uses less digits than its factorization.

221672213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280363.

The product of its digits is 2016, while the sum is 26.

The square root of 221672213 is about 14888.6605509025. The cubic root of 221672213 is about 605.2067348945.

The spelling of 221672213 in words is "two hundred twenty-one million, six hundred seventy-two thousand, two hundred thirteen".