21175075013 has 4 divisors (see below), whose sum is σ = 21176527968. Its totient is φ = 21173622060.

The previous prime is 21175074941. The next prime is 21175075039. The reversal of 21175075013 is 31057057112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21175075013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21175075073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 704393 + ... + 733838.

It is an arithmetic number, because the mean of its divisors is an integer number (5294131992).

Almost surely, 2^21175075013 is an apocalyptic number.

It is an amenable number.

21175075013 is a deficient number, since it is larger than the sum of its proper divisors (1452955).

21175075013 is a wasteful number, since it uses less digits than its factorization.

21175075013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452954.

The product of its (nonzero) digits is 7350, while the sum is 32.

The spelling of 21175075013 in words is "twenty-one billion, one hundred seventy-five million, seventy-five thousand, thirteen".