11011111021 has 8 divisors (see below), whose sum is σ = 12272446080. Its totient is φ = 9817956288.

The previous prime is 11011111009. The next prime is 11011111031. The reversal of 11011111021 is 12011111011.

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 11011111021 - 2¹⁹ = 11010586733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11011110989 and 11011111007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011111031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17044741 + ... + 17045386.

It is an arithmetic number, because the mean of its divisors is an integer number (1534055760).

Almost surely, 2^11011111021 is an apocalyptic number.

It is an amenable number.

11011111021 is a deficient number, since it is larger than the sum of its proper divisors (1261335059).

11011111021 is a wasteful number, since it uses less digits than its factorization.

11011111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34090163.

The product of its (nonzero) digits is 2, while the sum is 10.

Subtracting from 11011111021 its sum of digits (10), we obtain a palindrome (11011111011).

Adding to 11011111021 its reverse (12011111011), we get a palindrome (23022222032).

The spelling of 11011111021 in words is "eleven billion, eleven million, one hundred eleven thousand, twenty-one".