21424240111 has 8 divisors (see below), whose sum is σ = 22020130800. Its totient is φ = 20836242240.

The previous prime is 21424240087. The next prime is 21424240139. The reversal of 21424240111 is 11104242412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21424240111 - 2⁷ = 21424239983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21424240171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1967701 + ... + 1978558.

It is an arithmetic number, because the mean of its divisors is an integer number (2752516350).

Almost surely, 2^21424240111 is an apocalyptic number.

21424240111 is a deficient number, since it is larger than the sum of its proper divisors (595890689).

21424240111 is an equidigital number, since it uses as much as digits as its factorization.

21424240111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3946409.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21424240111 its reverse (11104242412), we get a palindrome (32528482523).

It can be divided in two parts, 214242401 and 11, that added together give a palindrome (214242412).

The spelling of 21424240111 in words is "twenty-one billion, four hundred twenty-four million, two hundred forty thousand, one hundred eleven".