21101307839 has 2 divisors, whose sum is σ = 21101307840. Its totient is φ = 21101307838.

The previous prime is 21101307833. The next prime is 21101307889. The reversal of 21101307839 is 93870310112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21101307839 - 2¹⁶ = 21101242303 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21101307799 and 21101307808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101307833) 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, 10550653919 + 10550653920.

It is an arithmetic number, because the mean of its divisors is an integer number (10550653920).

Almost surely, 2^21101307839 is an apocalyptic number.

21101307839 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101307839 is an equidigital number, since it uses as much as digits as its factorization.

21101307839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The spelling of 21101307839 in words is "twenty-one billion, one hundred one million, three hundred seven thousand, eight hundred thirty-nine".