11001111021 has 48 divisors (see below), whose sum is σ = 16519492080. Its totient is φ = 7049687040.

The previous prime is 11001110983. The next prime is 11001111041. The reversal of 11001111021 is 12011110011.

It can be written as a sum of positive squares in 8 ways, for example, as 62252100 + 10938858921 = 7890^2 + 104589^2 .

It is not a de Polignac number, because 11001111021 - 2¹⁸ = 11000848877 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 11001110994 and 11001111012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001111041) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15007971 + ... + 15008703.

It is an arithmetic number, because the mean of its divisors is an integer number (344156085).

Almost surely, 2^11001111021 is an apocalyptic number.

It is an amenable number.

11001111021 is a deficient number, since it is larger than the sum of its proper divisors (5518381059).

11001111021 is a wasteful number, since it uses less digits than its factorization.

11001111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326 (or 1323 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 11001111021 its reverse (12011110011), we get a palindrome (23012221032).

The spelling of 11001111021 in words is "eleven billion, one million, one hundred eleven thousand, twenty-one".