221222010666 has 8 divisors (see below), whose sum is σ = 442444021344. Its totient is φ = 73740670220.

The previous prime is 221222010643. The next prime is 221222010703. The reversal of 221222010666 is 666010222122.

It is a happy number.

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

221222010666 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18435167550 + ... + 18435167561.

It is an arithmetic number, because the mean of its divisors is an integer number (55305502668).

Almost surely, 2^221222010666 is an apocalyptic number.

221222010666 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.

221222010666 is a wasteful number, since it uses less digits than its factorization.

221222010666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36870335116.

The product of its (nonzero) digits is 6912, while the sum is 30.

Adding to 221222010666 its reverse (666010222122), we get a palindrome (887232232788).

It can be divided in two parts, 2212220 and 10666, that added together give a triangular number (2222886 = T₂₁₀₈).

The spelling of 221222010666 in words is "two hundred twenty-one billion, two hundred twenty-two million, ten thousand, six hundred sixty-six".