221100000121206 has 80 divisors (see below), whose sum is σ = 529044123738240. Its totient is φ = 68863181304960.

The previous prime is 221100000121159. The next prime is 221100000121219. The reversal of 221100000121206 is 602121000001122.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 758928231 + ... + 759219506.

It is an arithmetic number, because the mean of its divisors is an integer number (6613051546728).

Almost surely, 2^{221100000121206} is an apocalyptic number.

221100000121206 is an abundant number, since it is smaller than the sum of its proper divisors (307944123617034).

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

221100000121206 is a wasteful number, since it uses less digits than its factorization.

221100000121206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1518147811 (or 1518147802 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 221100000121206 its reverse (602121000001122), we get a palindrome (823221000122328).

The spelling of 221100000121206 in words is "two hundred twenty-one trillion, one hundred billion, one hundred twenty-one thousand, two hundred six".