21131440039 has 2 divisors, whose sum is σ = 21131440040. Its totient is φ = 21131440038.

The previous prime is 21131440027. The next prime is 21131440061. The reversal of 21131440039 is 93004413112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21131440039 - 2¹⁷ = 21131308967 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21131439989 and 21131440016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21131440019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565720019 + 10565720020.

It is an arithmetic number, because the mean of its divisors is an integer number (10565720020).

Almost surely, 2^21131440039 is an apocalyptic number.

21131440039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21131440039 is an equidigital number, since it uses as much as digits as its factorization.

21131440039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 21131440039 in words is "twenty-one billion, one hundred thirty-one million, four hundred forty thousand, thirty-nine".