20111323321 has 4 divisors (see below), whose sum is σ = 20601843444. Its totient is φ = 19620803200.

The previous prime is 20111323301. The next prime is 20111323339. The reversal of 20111323321 is 12332311102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12332311102 = 2 ⋅6166155551.

It can be written as a sum of positive squares in 2 ways, for example, as 2240980921 + 17870342400 = 47339^2 + 133680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111323321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111323301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245260000 + ... + 245260081.

It is an arithmetic number, because the mean of its divisors is an integer number (5150460861).

Almost surely, 2^20111323321 is an apocalyptic number.

It is an amenable number.

20111323321 is a deficient number, since it is larger than the sum of its proper divisors (490520123).

20111323321 is an equidigital number, since it uses as much as digits as its factorization.

20111323321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490520122.

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

Adding to 20111323321 its reverse (12332311102), we get a palindrome (32443634423).

The spelling of 20111323321 in words is "twenty billion, one hundred eleven million, three hundred twenty-three thousand, three hundred twenty-one".