11321230021 has 4 divisors (see below), whose sum is σ = 11348910700. Its totient is φ = 11293549344.

The previous prime is 11321230013. The next prime is 11321230027. The reversal of 11321230021 is 12003212311.

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 5567248996 + 5753981025 = 74614^2 + 75855^2 .

It is a cyclic number.

It is not a de Polignac number, because 11321230021 - 2³ = 11321230013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11321229977 and 11321230004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11321230027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13839726 + ... + 13840543.

It is an arithmetic number, because the mean of its divisors is an integer number (2837227675).

Almost surely, 2^11321230021 is an apocalyptic number.

It is an amenable number.

11321230021 is a deficient number, since it is larger than the sum of its proper divisors (27680679).

11321230021 is an equidigital number, since it uses as much as digits as its factorization.

11321230021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27680678.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 11321230021 its reverse (12003212311), we get a palindrome (23324442332).

The spelling of 11321230021 in words is "eleven billion, three hundred twenty-one million, two hundred thirty thousand, twenty-one".