21302782136579 has 16 divisors (see below), whose sum is σ = 21811727886336. Its totient is φ = 20796163920000.

The previous prime is 21302782136453. The next prime is 21302782136593. The reversal of 21302782136579 is 97563128720312.

It is a cyclic number.

It is not a de Polignac number, because 21302782136579 - 2²⁴ = 21302765359363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21302782139579) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 397776854 + ... + 397830404.

It is an arithmetic number, because the mean of its divisors is an integer number (1363232992896).

Almost surely, 2^{21302782136579} is an apocalyptic number.

21302782136579 is a deficient number, since it is larger than the sum of its proper divisors (508945749757).

21302782136579 is a wasteful number, since it uses less digits than its factorization.

21302782136579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75106.

The product of its (nonzero) digits is 7620480, while the sum is 56.

The spelling of 21302782136579 in words is "twenty-one trillion, three hundred two billion, seven hundred eighty-two million, one hundred thirty-six thousand, five hundred seventy-nine".