21434231111 has 2 divisors, whose sum is σ = 21434231112. Its totient is φ = 21434231110.

The previous prime is 21434231101. The next prime is 21434231131. The reversal of 21434231111 is 11113243412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21434231111 - 2²⁶ = 21367122247 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21434231101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10717115555 + 10717115556.

It is an arithmetic number, because the mean of its divisors is an integer number (10717115556).

Almost surely, 2^21434231111 is an apocalyptic number.

21434231111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21434231111 is an equidigital number, since it uses as much as digits as its factorization.

21434231111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 23.

Adding to 21434231111 its reverse (11113243412), we get a palindrome (32547474523).

The spelling of 21434231111 in words is "twenty-one billion, four hundred thirty-four million, two hundred thirty-one thousand, one hundred eleven".