11012111021 has 4 divisors (see below), whose sum is σ = 11015299932. Its totient is φ = 11008922112.

The previous prime is 11012111003. The next prime is 11012111023. The reversal of 11012111021 is 12011121011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12011121011 = 41 ⋅292954171.

It can be written as a sum of positive squares in 2 ways, for example, as 4452892900 + 6559218121 = 66730^2 + 80989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11012111021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11012110993 and 11012111011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11012111023) 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 3 ways as a sum of consecutive naturals, for example, 1589270 + ... + 1596183.

It is an arithmetic number, because the mean of its divisors is an integer number (2753824983).

Almost surely, 2^11012111021 is an apocalyptic number.

It is an amenable number.

11012111021 is a deficient number, since it is larger than the sum of its proper divisors (3188911).

11012111021 is an equidigital number, since it uses as much as digits as its factorization.

11012111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3188910.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 11012111021 its reverse (12011121011), we get a palindrome (23023232032).

The spelling of 11012111021 in words is "eleven billion, twelve million, one hundred eleven thousand, twenty-one".