21203111339 has 2 divisors, whose sum is σ = 21203111340. Its totient is φ = 21203111338.

The previous prime is 21203111317. The next prime is 21203111353. The reversal of 21203111339 is 93311130212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21203111339 - 2¹² = 21203107243 is a prime.

It is not a weakly prime, because it can be changed into another prime (21203111539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601555669 + 10601555670.

It is an arithmetic number, because the mean of its divisors is an integer number (10601555670).

Almost surely, 2^21203111339 is an apocalyptic number.

21203111339 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203111339 is an equidigital number, since it uses as much as digits as its factorization.

21203111339 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 26.

The spelling of 21203111339 in words is "twenty-one billion, two hundred three million, one hundred eleven thousand, three hundred thirty-nine".