11121311021 has 8 divisors (see below), whose sum is σ = 11927524320. Its totient is φ = 10337185872.

The previous prime is 11121311009. The next prime is 11121311029. The reversal of 11121311021 is 12011312111.

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 11121311021 - 2²⁶ = 11054202157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11121310987 and 11121311005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121311029) 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 7 ways as a sum of consecutive naturals, for example, 5520995 + ... + 5523008.

It is an arithmetic number, because the mean of its divisors is an integer number (1490940540).

Almost surely, 2^11121311021 is an apocalyptic number.

It is an amenable number.

11121311021 is a deficient number, since it is larger than the sum of its proper divisors (806213299).

11121311021 is a wasteful number, since it uses less digits than its factorization.

11121311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11044075.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 11121311021 its reverse (12011312111), we get a palindrome (23132623132).

The spelling of 11121311021 in words is "eleven billion, one hundred twenty-one million, three hundred eleven thousand, twenty-one".