221220914 has 8 divisors (see below), whose sum is σ = 349296240. Its totient is φ = 104788836.

The previous prime is 221220907. The next prime is 221220931. The reversal of 221220914 is 419022122.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221220914.

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 3 ways as a sum of consecutive naturals, for example, 2910764 + ... + 2910839.

It is an arithmetic number, because the mean of its divisors is an integer number (43662030).

Almost surely, 2^221220914 is an apocalyptic number.

221220914 is a deficient number, since it is larger than the sum of its proper divisors (128075326).

221220914 is a wasteful number, since it uses less digits than its factorization.

221220914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5821624.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 221220914 is about 14873.4970333140. The cubic root of 221220914 is about 604.7957455428.

The spelling of 221220914 in words is "two hundred twenty-one million, two hundred twenty thousand, nine hundred fourteen".