21144144311 has 2 divisors, whose sum is σ = 21144144312. Its totient is φ = 21144144310.

The previous prime is 21144144299. The next prime is 21144144313. The reversal of 21144144311 is 11344144112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21144144311 - 2¹⁸ = 21143882167 is a prime.

Together with 21144144313, 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 (21144144313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572072155 + 10572072156.

It is an arithmetic number, because the mean of its divisors is an integer number (10572072156).

Almost surely, 2^21144144311 is an apocalyptic number.

21144144311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21144144311 is an equidigital number, since it uses as much as digits as its factorization.

21144144311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536, while the sum is 26.

Adding to 21144144311 its reverse (11344144112), we get a palindrome (32488288423).

The spelling of 21144144311 in words is "twenty-one billion, one hundred forty-four million, one hundred forty-four thousand, three hundred eleven".