11931033012921 has 24 divisors (see below), whose sum is σ = 18840673579104. Its totient is φ = 7215445282560.

The previous prime is 11931033012889. The next prime is 11931033012959. The reversal of 11931033012921 is 12921033013911.

11931033012921 is a `hidden beast` number, since 1 + 1 + 9 + 31 + 0 + 330 + 1 + 292 + 1 = 666.

It is not a de Polignac number, because 11931033012921 - 2⁵ = 11931033012889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11931033010921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 128985336 + ... + 129077801.

It is an arithmetic number, because the mean of its divisors is an integer number (785028065796).

Almost surely, 2^{11931033012921} is an apocalyptic number.

11931033012921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11931033012921 is a deficient number, since it is larger than the sum of its proper divisors (6909640566183).

11931033012921 is a wasteful number, since it uses less digits than its factorization.

11931033012921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258063621 (or 258063618 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

It can be divided in two parts, 1193103 and 3012921, that added together give a palindrome (4206024).

The spelling of 11931033012921 in words is "eleven trillion, nine hundred thirty-one billion, thirty-three million, twelve thousand, nine hundred twenty-one".