21380264039 has 2 divisors, whose sum is σ = 21380264040. Its totient is φ = 21380264038.

The previous prime is 21380264033. The next prime is 21380264041. The reversal of 21380264039 is 93046208312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21380264039 - 2¹⁶ = 21380198503 is a prime.

Together with 21380264041, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21380263993 and 21380264011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21380264033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10690132019 + 10690132020.

It is an arithmetic number, because the mean of its divisors is an integer number (10690132020).

Almost surely, 2^21380264039 is an apocalyptic number.

21380264039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21380264039 is an equidigital number, since it uses as much as digits as its factorization.

21380264039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 38.

The spelling of 21380264039 in words is "twenty-one billion, three hundred eighty million, two hundred sixty-four thousand, thirty-nine".