9911012120231 has 4 divisors (see below), whose sum is σ = 9911027341152. Its totient is φ = 9910996899312.

The previous prime is 9911012120221. The next prime is 9911012120249. The reversal of 9911012120231 is 1320212101199.

It is a happy number.

9911012120231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9911012120231 - 2¹⁸ = 9911011858087 is a prime.

It is a super-2 number, since 2×9911012120231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9911012120221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6587951 + ... + 7951296.

It is an arithmetic number, because the mean of its divisors is an integer number (2477756835288).

Almost surely, 2^{9911012120231} is an apocalyptic number.

9911012120231 is a deficient number, since it is larger than the sum of its proper divisors (15220921).

9911012120231 is a wasteful number, since it uses less digits than its factorization.

9911012120231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15220920.

The product of its (nonzero) digits is 1944, while the sum is 32.

The spelling of 9911012120231 in words is "nine trillion, nine hundred eleven billion, twelve million, one hundred twenty thousand, two hundred thirty-one".