991022122222112 has 72 divisors (see below), whose sum is σ = 2017592646454476. Its totient is φ = 479158230720000.

The previous prime is 991022122222037. The next prime is 991022122222147. The reversal of 991022122222112 is 211222221220199.

It can be written as a sum of positive squares in 2 ways, for example, as 669385014370576 + 321637107851536 = 25872476^2 + 17934244^2 .

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 11 ways as a sum of consecutive naturals, for example, 27623162 + ... + 52393542.

Almost surely, 2^{991022122222112} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991022122222112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1008796323227238).

991022122222112 is an abundant number, since it is smaller than the sum of its proper divisors (1026570524232364).

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

991022122222112 is a wasteful number, since it uses less digits than its factorization.

991022122222112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24771754 (or 24771715 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The spelling of 991022122222112 in words is "nine hundred ninety-one trillion, twenty-two billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred twelve".