21175075039 has 2 divisors, whose sum is σ = 21175075040. Its totient is φ = 21175075038.

The previous prime is 21175074941. The next prime is 21175075049. The reversal of 21175075039 is 93057057112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21175075039 - 2⁷ = 21175074911 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21175074992 and 21175075010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21175075049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10587537519 + 10587537520.

It is an arithmetic number, because the mean of its divisors is an integer number (10587537520).

Almost surely, 2^21175075039 is an apocalyptic number.

21175075039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21175075039 is an equidigital number, since it uses as much as digits as its factorization.

21175075039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 66150, while the sum is 40.

The spelling of 21175075039 in words is "twenty-one billion, one hundred seventy-five million, seventy-five thousand, thirty-nine".