21111311239 has 2 divisors, whose sum is σ = 21111311240. Its totient is φ = 21111311238.

The previous prime is 21111311227. The next prime is 21111311251. The reversal of 21111311239 is 93211311112.

It is a balanced prime because it is at equal distance from previous prime (21111311227) and next prime (21111311251).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21111311239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21111311269) 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, 10555655619 + 10555655620.

It is an arithmetic number, because the mean of its divisors is an integer number (10555655620).

Almost surely, 2^21111311239 is an apocalyptic number.

21111311239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111311239 is an equidigital number, since it uses as much as digits as its factorization.

21111311239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 25.

The spelling of 21111311239 in words is "twenty-one billion, one hundred eleven million, three hundred eleven thousand, two hundred thirty-nine".