9900111111211 has 2 divisors, whose sum is σ = 9900111111212. Its totient is φ = 9900111111210.

The previous prime is 9900111111157. The next prime is 9900111111239. The reversal of 9900111111211 is 1121111110099.

It is an a-pointer prime, because the next prime (9900111111239) can be obtained adding 9900111111211 to its sum of digits (28).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9900111111211 - 2²³ = 9900102722603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9900111111211.

It is not a weakly prime, because it can be changed into another prime (9900111111271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4950055555605 + 4950055555606.

It is an arithmetic number, because the mean of its divisors is an integer number (4950055555606).

Almost surely, 2^{9900111111211} is an apocalyptic number.

9900111111211 is a deficient number, since it is larger than the sum of its proper divisors (1).

9900111111211 is an equidigital number, since it uses as much as digits as its factorization.

9900111111211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 28.

It can be divided in two parts, 9900 and 111111211, that added together give a palindrome (111121111).

The spelling of 9900111111211 in words is "nine trillion, nine hundred billion, one hundred eleven million, one hundred eleven thousand, two hundred eleven".