11130020021 has 4 divisors (see below), whose sum is σ = 11130231372. Its totient is φ = 11129808672.

The previous prime is 11130020017. The next prime is 11130020129. The reversal of 11130020021 is 12002003111.

11130020021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5784363025 + 5345656996 = 76055^2 + 73114^2 .

It is a cyclic number.

It is not a de Polignac number, because 11130020021 - 2² = 11130020017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11130019984 and 11130020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11130022021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43691 + ... + 155463.

It is an arithmetic number, because the mean of its divisors is an integer number (2782557843).

Almost surely, 2^11130020021 is an apocalyptic number.

It is an amenable number.

11130020021 is a deficient number, since it is larger than the sum of its proper divisors (211351).

11130020021 is an equidigital number, since it uses as much as digits as its factorization.

11130020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211350.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 11130020021 its reverse (12002003111), we get a palindrome (23132023132).

The spelling of 11130020021 in words is "eleven billion, one hundred thirty million, twenty thousand, twenty-one".