21323026111 has 4 divisors (see below), whose sum is σ = 21899324152. Its totient is φ = 20746728072.

The previous prime is 21323026103. The next prime is 21323026187. The reversal of 21323026111 is 11162032312.

It is a happy number.

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 21323026111 - 2³ = 21323026103 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 (21323024111) 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, 288148965 + ... + 288149038.

It is an arithmetic number, because the mean of its divisors is an integer number (5474831038).

Almost surely, 2^21323026111 is an apocalyptic number.

21323026111 is a deficient number, since it is larger than the sum of its proper divisors (576298041).

21323026111 is an equidigital number, since it uses as much as digits as its factorization.

21323026111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576298040.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21323026111 its reverse (11162032312), we get a palindrome (32485058423).

The spelling of 21323026111 in words is "twenty-one billion, three hundred twenty-three million, twenty-six thousand, one hundred eleven".