11021320321 has 4 divisors (see below), whose sum is σ = 12023258544. Its totient is φ = 10019382100.

The previous prime is 11021320313. The next prime is 11021320333. The reversal of 11021320321 is 12302312011.

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.

It is a cyclic number.

It is not a de Polignac number, because 11021320321 - 2³ = 11021320313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11021320295 and 11021320304.

It is not an unprimeable number, because it can be changed into a prime (11021320381) 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, 500969095 + ... + 500969116.

It is an arithmetic number, because the mean of its divisors is an integer number (3005814636).

Almost surely, 2^11021320321 is an apocalyptic number.

11021320321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11021320321 is a deficient number, since it is larger than the sum of its proper divisors (1001938223).

11021320321 is a wasteful number, since it uses less digits than its factorization.

11021320321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001938222.

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

Adding to 11021320321 its reverse (12302312011), we get a palindrome (23323632332).

The spelling of 11021320321 in words is "eleven billion, twenty-one million, three hundred twenty thousand, three hundred twenty-one".