21323113111 has 4 divisors (see below), whose sum is σ = 21346066800. Its totient is φ = 21300159424.

The previous prime is 21323113103. The next prime is 21323113151. The reversal of 21323113111 is 11131132312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21323113111 - 2³ = 21323113103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323113151) 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, 11475451 + ... + 11477308.

It is an arithmetic number, because the mean of its divisors is an integer number (5336516700).

Almost surely, 2^21323113111 is an apocalyptic number.

21323113111 is a deficient number, since it is larger than the sum of its proper divisors (22953689).

21323113111 is an equidigital number, since it uses as much as digits as its factorization.

21323113111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22953688.

The product of its digits is 108, while the sum is 19.

Adding to 21323113111 its reverse (11131132312), we get a palindrome (32454245423).

The spelling of 21323113111 in words is "twenty-one billion, three hundred twenty-three million, one hundred thirteen thousand, one hundred eleven".