21440000111 has 2 divisors, whose sum is σ = 21440000112. Its totient is φ = 21440000110.

The previous prime is 21440000107. The next prime is 21440000189. The reversal of 21440000111 is 11100004412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21440000111 - 2² = 21440000107 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21440030111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10720000055 + 10720000056.

It is an arithmetic number, because the mean of its divisors is an integer number (10720000056).

Almost surely, 2^21440000111 is an apocalyptic number.

21440000111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21440000111 is an equidigital number, since it uses as much as digits as its factorization.

21440000111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21440000111 its reverse (11100004412), we get a palindrome (32540004523).

The spelling of 21440000111 in words is "twenty-one billion, four hundred forty million, one hundred eleven", and thus it is an aban number.