21082493139 has 4 divisors (see below), whose sum is σ = 28109990856. Its totient is φ = 14054995424.

The previous prime is 21082493129. The next prime is 21082493147. The reversal of 21082493139 is 93139428012.

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 21082493139 - 2⁸ = 21082492883 is a prime.

It is a super-3 number, since 3×21082493139³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21082493139.

It is not an unprimeable number, because it can be changed into a prime (21082493129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3513748854 + ... + 3513748859.

It is an arithmetic number, because the mean of its divisors is an integer number (7027497714).

Almost surely, 2^21082493139 is an apocalyptic number.

21082493139 is a deficient number, since it is larger than the sum of its proper divisors (7027497717).

21082493139 is an equidigital number, since it uses as much as digits as its factorization.

21082493139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7027497716.

The product of its (nonzero) digits is 93312, while the sum is 42.

The spelling of 21082493139 in words is "twenty-one billion, eighty-two million, four hundred ninety-three thousand, one hundred thirty-nine".