9911222210221 has 16 divisors (see below), whose sum is σ = 10247040640000. Its totient is φ = 9576422069760.

The previous prime is 9911222210191. The next prime is 9911222210231. The reversal of 9911222210221 is 1220122221199.

It is a happy number.

It is not a de Polignac number, because 9911222210221 - 2⁹ = 9911222209709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9911222210231) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 50352631 + ... + 50549083.

It is an arithmetic number, because the mean of its divisors is an integer number (640440040000).

Almost surely, 2^{9911222210221} is an apocalyptic number.

It is an amenable number.

9911222210221 is a deficient number, since it is larger than the sum of its proper divisors (335818429779).

9911222210221 is a wasteful number, since it uses less digits than its factorization.

9911222210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199036.

The product of its (nonzero) digits is 5184, while the sum is 34.

The spelling of 9911222210221 in words is "nine trillion, nine hundred eleven billion, two hundred twenty-two million, two hundred ten thousand, two hundred twenty-one".