11321020021 has 16 divisors (see below), whose sum is σ = 12040758400. Its totient is φ = 10613913408.

The previous prime is 11321020019. The next prime is 11321020037. The reversal of 11321020021 is 12002012311.

It is a cyclic number.

It is not a de Polignac number, because 11321020021 - 2¹ = 11321020019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11321019983 and 11321020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11321020421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1999831 + ... + 2005483.

It is an arithmetic number, because the mean of its divisors is an integer number (752547400).

Almost surely, 2^11321020021 is an apocalyptic number.

It is an amenable number.

11321020021 is a deficient number, since it is larger than the sum of its proper divisors (719738379).

11321020021 is a wasteful number, since it uses less digits than its factorization.

11321020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6748.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 11321020021 its reverse (12002012311), we get a palindrome (23323032332).

The spelling of 11321020021 in words is "eleven billion, three hundred twenty-one million, twenty thousand, twenty-one".