221673388 has 12 divisors (see below), whose sum is σ = 397390392. Its totient is φ = 108133280.

The previous prime is 221673383. The next prime is 221673433. The reversal of 221673388 is 883376122.

It is a self number, because there is not a number n which added to its sum of digits gives 221673388.

It is not an unprimeable number, because it can be changed into a prime (221673383) 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 3 ways as a sum of consecutive naturals, for example, 675670 + ... + 675997.

It is an arithmetic number, because the mean of its divisors is an integer number (33115866).

Almost surely, 2^221673388 is an apocalyptic number.

It is an amenable number.

221673388 is a deficient number, since it is larger than the sum of its proper divisors (175717004).

221673388 is a wasteful number, since it uses less digits than its factorization.

221673388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351712 (or 1351710 counting only the distinct ones).

The product of its digits is 96768, while the sum is 40.

The square root of 221673388 is about 14888.7000104106. The cubic root of 221673388 is about 605.2078042161.

The spelling of 221673388 in words is "two hundred twenty-one million, six hundred seventy-three thousand, three hundred eighty-eight".