221399814 has 8 divisors (see below), whose sum is σ = 442799640. Its totient is φ = 73799936.

The previous prime is 221399807. The next prime is 221399851. The reversal of 221399814 is 418993122.

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

221399814 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18449979 + ... + 18449990.

It is an arithmetic number, because the mean of its divisors is an integer number (55349955).

Almost surely, 2^221399814 is an apocalyptic number.

221399814 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

221399814 is a wasteful number, since it uses less digits than its factorization.

221399814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36899974.

The product of its digits is 31104, while the sum is 39.

The square root of 221399814 is about 14879.5098709601. The cubic root of 221399814 is about 604.9587331550.

The spelling of 221399814 in words is "two hundred twenty-one million, three hundred ninety-nine thousand, eight hundred fourteen".