11031100021 has 2 divisors, whose sum is σ = 11031100022. Its totient is φ = 11031100020.

The previous prime is 11031100019. The next prime is 11031100027. The reversal of 11031100021 is 12000113011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10688664996 + 342435025 = 103386^2 + 18505^2 .

It is an emirp because it is prime and its reverse (12000113011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11031100021 - 2¹ = 11031100019 is a prime.

Together with 11031100019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 11031099980 and 11031100007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11031100027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5515550010 + 5515550011.

It is an arithmetic number, because the mean of its divisors is an integer number (5515550011).

Almost surely, 2^11031100021 is an apocalyptic number.

It is an amenable number.

11031100021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11031100021 is an equidigital number, since it uses as much as digits as its factorization.

11031100021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6, while the sum is 10.

Adding to 11031100021 its reverse (12000113011), we get a palindrome (23031213032).

The spelling of 11031100021 in words is "eleven billion, thirty-one million, one hundred thousand, twenty-one".