9900112012221 has 16 divisors (see below), whose sum is σ = 13896209830400. Its totient is φ = 6252110223408.

The previous prime is 9900112012201. The next prime is 9900112012223. The reversal of 9900112012221 is 1222102110099.

It is not a de Polignac number, because 9900112012221 - 2¹⁸ = 9900111750077 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 (9900112012223) 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, 7616011 + ... + 8820648.

It is an arithmetic number, because the mean of its divisors is an integer number (868513114400).

Almost surely, 2^{9900112012221} is an apocalyptic number.

It is an amenable number.

9900112012221 is a deficient number, since it is larger than the sum of its proper divisors (3996097818179).

9900112012221 is a wasteful number, since it uses less digits than its factorization.

9900112012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16447248.

The product of its (nonzero) digits is 1296, while the sum is 30.

The spelling of 9900112012221 in words is "nine trillion, nine hundred billion, one hundred twelve million, twelve thousand, two hundred twenty-one".