221694220 has 24 divisors (see below), whose sum is σ = 507881808. Its totient is φ = 80616000.

The previous prime is 221694203. The next prime is 221694233. The reversal of 221694220 is 22496122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 503631 + ... + 504070.

It is an arithmetic number, because the mean of its divisors is an integer number (21161742).

Almost surely, 2^221694220 is an apocalyptic number.

221694220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221694220 is an abundant number, since it is smaller than the sum of its proper divisors (286187588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221694220 is a wasteful number, since it uses less digits than its factorization.

221694220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007721 (or 1007719 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 221694220 is about 14889.3995849396. The cubic root of 221694220 is about 605.2267619782.

The spelling of 221694220 in words is "two hundred twenty-one million, six hundred ninety-four thousand, two hundred twenty".