21423578822579 has 2 divisors, whose sum is σ = 21423578822580. Its totient is φ = 21423578822578.

The previous prime is 21423578822549. The next prime is 21423578822623. The reversal of 21423578822579 is 97522887532412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21423578822579 - 2²⁰ = 21423577774003 is a prime.

It is a super-2 number, since 2×21423578822579² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21423578822549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711789411289 + 10711789411290.

It is an arithmetic number, because the mean of its divisors is an integer number (10711789411290).

Almost surely, 2^{21423578822579} is an apocalyptic number.

21423578822579 is a deficient number, since it is larger than the sum of its proper divisors (1).

21423578822579 is an equidigital number, since it uses as much as digits as its factorization.

21423578822579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 135475200, while the sum is 65.

The spelling of 21423578822579 in words is "twenty-one trillion, four hundred twenty-three billion, five hundred seventy-eight million, eight hundred twenty-two thousand, five hundred seventy-nine".