221673830 has 16 divisors (see below), whose sum is σ = 456014880. Its totient is φ = 76002432.

The previous prime is 221673821. The next prime is 221673841. The reversal of 221673830 is 38376122.

It is a happy number.

221673830 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1583315 + ... + 1583454.

It is an arithmetic number, because the mean of its divisors is an integer number (28500930).

Almost surely, 2^221673830 is an apocalyptic number.

221673830 is an abundant number, since it is smaller than the sum of its proper divisors (234341050).

221673830 is a wasteful number, since it uses less digits than its factorization.

221673830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3166783.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 221673830 is about 14888.7148538751. The cubic root of 221673830 is about 605.2082064621.

The spelling of 221673830 in words is "two hundred twenty-one million, six hundred seventy-three thousand, eight hundred thirty".