21254323579 has 2 divisors, whose sum is σ = 21254323580. Its totient is φ = 21254323578.

The previous prime is 21254323553. The next prime is 21254323663. The reversal of 21254323579 is 97532345212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21254323579 - 2¹⁷ = 21254192507 is a prime.

It is not a weakly prime, because it can be changed into another prime (21254326579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10627161789 + 10627161790.

It is an arithmetic number, because the mean of its divisors is an integer number (10627161790).

Almost surely, 2^21254323579 is an apocalyptic number.

21254323579 is a deficient number, since it is larger than the sum of its proper divisors (1).

21254323579 is an equidigital number, since it uses as much as digits as its factorization.

21254323579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 453600, while the sum is 43.

The spelling of 21254323579 in words is "twenty-one billion, two hundred fifty-four million, three hundred twenty-three thousand, five hundred seventy-nine".