11232320021 has 4 divisors (see below), whose sum is σ = 12096344652. Its totient is φ = 10368295392.

The previous prime is 11232319979. The next prime is 11232320023. The reversal of 11232320021 is 12002323211.

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 7460640625 + 3771679396 = 86375^2 + 61414^2 .

It is a de Polignac number, because none of the positive numbers 2^k-11232320021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11232320023) 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, 432012296 + ... + 432012321.

It is an arithmetic number, because the mean of its divisors is an integer number (3024086163).

Almost surely, 2^11232320021 is an apocalyptic number.

It is an amenable number.

11232320021 is a deficient number, since it is larger than the sum of its proper divisors (864024631).

11232320021 is an equidigital number, since it uses as much as digits as its factorization.

11232320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864024630.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 11232320021 its reverse (12002323211), we get a palindrome (23234643232).

The spelling of 11232320021 in words is "eleven billion, two hundred thirty-two million, three hundred twenty thousand, twenty-one".