9921201111 has 16 divisors (see below), whose sum is σ = 14699672800. Its totient is φ = 6613415424.

The previous prime is 9921201089. The next prime is 9921201113. The reversal of 9921201111 is 1111021299.

It is not a de Polignac number, because 9921201111 - 2⁷ = 9921200983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9921201113) 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, 375735 + ... + 401271.

It is an arithmetic number, because the mean of its divisors is an integer number (918729550).

Almost surely, 2^9921201111 is an apocalyptic number.

9921201111 is a deficient number, since it is larger than the sum of its proper divisors (4778471689).

9921201111 is a wasteful number, since it uses less digits than its factorization.

9921201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39935 (or 39929 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 27.

The square root of 9921201111 is about 99605.2263237226. The cubic root of 9921201111 is about 2148.7608587788.

The spelling of 9921201111 in words is "nine billion, nine hundred twenty-one million, two hundred one thousand, one hundred eleven".