21082604239 has 2 divisors, whose sum is σ = 21082604240. Its totient is φ = 21082604238.

The previous prime is 21082604233. The next prime is 21082604299. The reversal of 21082604239 is 93240628012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21082604239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21082604198 and 21082604207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21082604233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10541302119 + 10541302120.

It is an arithmetic number, because the mean of its divisors is an integer number (10541302120).

Almost surely, 2^21082604239 is an apocalyptic number.

21082604239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21082604239 is an equidigital number, since it uses as much as digits as its factorization.

21082604239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 21082604239 in words is "twenty-one billion, eighty-two million, six hundred four thousand, two hundred thirty-nine".