21111111143 has 2 divisors, whose sum is σ = 21111111144. Its totient is φ = 21111111142.

The previous prime is 21111111107. The next prime is 21111111167. The reversal of 21111111143 is 34111111112.

It is a m-pointer prime, because the next prime (21111111167) can be obtained adding 21111111143 to its product of digits (24).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21111111143 - 2²⁴ = 21094333927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21111111443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555555571 + 10555555572.

It is an arithmetic number, because the mean of its divisors is an integer number (10555555572).

Almost surely, 2^21111111143 is an apocalyptic number.

21111111143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111111143 is an equidigital number, since it uses as much as digits as its factorization.

21111111143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24, while the sum is 17.

Adding to 21111111143 its reverse (34111111112), we get a palindrome (55222222255).

The spelling of 21111111143 in words is "twenty-one billion, one hundred eleven million, one hundred eleven thousand, one hundred forty-three".