21234444311 has 2 divisors, whose sum is σ = 21234444312. Its totient is φ = 21234444310.

The previous prime is 21234444247. The next prime is 21234444313. The reversal of 21234444311 is 11344443212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21234444311 - 2⁶ = 21234444247 is a prime.

Together with 21234444313, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21234444313) 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, 10617222155 + 10617222156.

It is an arithmetic number, because the mean of its divisors is an integer number (10617222156).

Almost surely, 2^21234444311 is an apocalyptic number.

21234444311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234444311 is an equidigital number, since it uses as much as digits as its factorization.

21234444311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 29.

Adding to 21234444311 its reverse (11344443212), we get a palindrome (32578887523).

The spelling of 21234444311 in words is "twenty-one billion, two hundred thirty-four million, four hundred forty-four thousand, three hundred eleven".