11323312021 has 4 divisors (see below), whose sum is σ = 12940928032. Its totient is φ = 9705696012.

The previous prime is 11323312003. The next prime is 11323312027. The reversal of 11323312021 is 12021332311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12021332311 = 2887 ⋅4163953.

It is a cyclic number.

It is not a de Polignac number, because 11323312021 - 2⁹ = 11323311509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11323312021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11323312027) 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, 808807995 + ... + 808808008.

It is an arithmetic number, because the mean of its divisors is an integer number (3235232008).

Almost surely, 2^11323312021 is an apocalyptic number.

It is an amenable number.

11323312021 is a deficient number, since it is larger than the sum of its proper divisors (1617616011).

11323312021 is an equidigital number, since it uses as much as digits as its factorization.

11323312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1617616010.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 11323312021 its reverse (12021332311), we get a palindrome (23344644332).

The spelling of 11323312021 in words is "eleven billion, three hundred twenty-three million, three hundred twelve thousand, twenty-one".