221481814 has 16 divisors (see below), whose sum is σ = 352284768. Its totient is φ = 104072832.

The previous prime is 221481791. The next prime is 221481823. The reversal of 221481814 is 418184122.

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, 20479 + ... + 29365.

It is an arithmetic number, because the mean of its divisors is an integer number (22017798).

Almost surely, 2^221481814 is an apocalyptic number.

221481814 is a deficient number, since it is larger than the sum of its proper divisors (130802954).

221481814 is a wasteful number, since it uses less digits than its factorization.

221481814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9639.

The product of its digits is 4096, while the sum is 31.

The square root of 221481814 is about 14882.2650829771. The cubic root of 221481814 is about 605.0334102625.

The spelling of 221481814 in words is "two hundred twenty-one million, four hundred eighty-one thousand, eight hundred fourteen".