12011011111021 has 8 divisors (see below), whose sum is σ = 12958844357144. Its totient is φ = 11066593481280.

The previous prime is 12011011110997. The next prime is 12011011111027. The reversal of 12011011111021 is 12011111011021.

It can be written as a sum of positive squares in 4 ways, for example, as 14063588100 + 11996947522921 = 118590^2 + 3463661^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12011011111021 - 2⁷ = 12011011110893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12011011110992 and 12011011111010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011011111027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 853896786 + ... + 853910851.

It is an arithmetic number, because the mean of its divisors is an integer number (1619855544643).

Almost surely, 2^{12011011111021} is an apocalyptic number.

It is an amenable number.

12011011111021 is a deficient number, since it is larger than the sum of its proper divisors (947833246123).

12011011111021 is a wasteful number, since it uses less digits than its factorization.

12011011111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1707808191.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 12011011111021 its reverse (12011111011021), we get a palindrome (24022122122042).

The spelling of 12011011111021 in words is "twelve trillion, eleven billion, eleven million, one hundred eleven thousand, twenty-one".