21381320512039 has 2 divisors, whose sum is σ = 21381320512040. Its totient is φ = 21381320512038.

The previous prime is 21381320511997. The next prime is 21381320512043. The reversal of 21381320512039 is 93021502318312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21381320512039 - 2²¹ = 21381318414887 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21381320511992 and 21381320512010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21381320512939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10690660256019 + 10690660256020.

It is an arithmetic number, because the mean of its divisors is an integer number (10690660256020).

Almost surely, 2^{21381320512039} is an apocalyptic number.

21381320512039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21381320512039 is an equidigital number, since it uses as much as digits as its factorization.

21381320512039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 21381320512039 in words is "twenty-one trillion, three hundred eighty-one billion, three hundred twenty million, five hundred twelve thousand, thirty-nine".