21424232111 has 4 divisors (see below), whose sum is σ = 21471948000. Its totient is φ = 21376516224.

The previous prime is 21424232077. The next prime is 21424232129. The reversal of 21424232111 is 11123242412.

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 21424232111 - 2⁶ = 21424232047 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 (21424252111) 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, 23857271 + ... + 23858168.

It is an arithmetic number, because the mean of its divisors is an integer number (5367987000).

Almost surely, 2^21424232111 is an apocalyptic number.

21424232111 is a deficient number, since it is larger than the sum of its proper divisors (47715889).

21424232111 is an equidigital number, since it uses as much as digits as its factorization.

21424232111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47715888.

The product of its digits is 768, while the sum is 23.

Adding to 21424232111 its reverse (11123242412), we get a palindrome (32547474523).

The spelling of 21424232111 in words is "twenty-one billion, four hundred twenty-four million, two hundred thirty-two thousand, one hundred eleven".