21093279539 has 4 divisors (see below), whose sum is σ = 21185390160. Its totient is φ = 21001168920.

The previous prime is 21093279527. The next prime is 21093279547. The reversal of 21093279539 is 93597239012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21093279539 - 2²⁴ = 21076502323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21093279589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46054967 + ... + 46055424.

It is an arithmetic number, because the mean of its divisors is an integer number (5296347540).

Almost surely, 2^21093279539 is an apocalyptic number.

21093279539 is a deficient number, since it is larger than the sum of its proper divisors (92110621).

21093279539 is an equidigital number, since it uses as much as digits as its factorization.

21093279539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92110620.

The product of its (nonzero) digits is 918540, while the sum is 50.

The spelling of 21093279539 in words is "twenty-one billion, ninety-three million, two hundred seventy-nine thousand, five hundred thirty-nine".