21144341111 has 2 divisors, whose sum is σ = 21144341112. Its totient is φ = 21144341110.

The previous prime is 21144341069. The next prime is 21144341137. The reversal of 21144341111 is 11114344112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21144341111 - 2¹⁴ = 21144324727 is a prime.

It is a super-2 number, since 2×21144341111² (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 (21144341171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572170555 + 10572170556.

It is an arithmetic number, because the mean of its divisors is an integer number (10572170556).

Almost surely, 2^21144341111 is an apocalyptic number.

21144341111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21144341111 is an equidigital number, since it uses as much as digits as its factorization.

21144341111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 23.

Adding to 21144341111 its reverse (11114344112), we get a palindrome (32258685223).

The spelling of 21144341111 in words is "twenty-one billion, one hundred forty-four million, three hundred forty-one thousand, one hundred eleven".