221221120206 has 8 divisors (see below), whose sum is σ = 442442240424. Its totient is φ = 73740373400.

The previous prime is 221221120199. The next prime is 221221120217. The reversal of 221221120206 is 602021122122.

221221120206 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

221221120206 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18435093345 + ... + 18435093356.

It is an arithmetic number, because the mean of its divisors is an integer number (55305280053).

Almost surely, 2^221221120206 is an apocalyptic number.

221221120206 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.

221221120206 is a wasteful number, since it uses less digits than its factorization.

221221120206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36870186706.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 221221120206 its reverse (602021122122), we get a palindrome (823242242328).

The spelling of 221221120206 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred twenty thousand, two hundred six".