991121002121112 has 64 divisors (see below), whose sum is σ = 2478662985889920. Its totient is φ = 330258943623168.

The previous prime is 991121002121111. The next prime is 991121002121119. The reversal of 991121002121112 is 211121200121199.

991121002121112 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×991121002121112² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991121002121111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2467072563 + ... + 2467474269.

It is an arithmetic number, because the mean of its divisors is an integer number (38729109154530).

Almost surely, 2^{991121002121112} is an apocalyptic number.

It is an amenable number.

991121002121112 is an abundant number, since it is smaller than the sum of its proper divisors (1487541983768808).

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

991121002121112 is a wasteful number, since it uses less digits than its factorization.

991121002121112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437160 (or 437156 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 33.

The spelling of 991121002121112 in words is "nine hundred ninety-one trillion, one hundred twenty-one billion, two million, one hundred twenty-one thousand, one hundred twelve".