21423041111 has 2 divisors, whose sum is σ = 21423041112. Its totient is φ = 21423041110.

The previous prime is 21423041099. The next prime is 21423041183. The reversal of 21423041111 is 11114032412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21423041111 - 2³⁰ = 20349299287 is a prime.

It is a super-2 number, since 2×21423041111² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21423041611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711520555 + 10711520556.

It is an arithmetic number, because the mean of its divisors is an integer number (10711520556).

Almost surely, 2^21423041111 is an apocalyptic number.

21423041111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21423041111 is an equidigital number, since it uses as much as digits as its factorization.

21423041111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21423041111 its reverse (11114032412), we get a palindrome (32537073523).

The spelling of 21423041111 in words is "twenty-one billion, four hundred twenty-three million, forty-one thousand, one hundred eleven".