21423578908569 has 16 divisors (see below), whose sum is σ = 30042559839744. Its totient is φ = 13560877699200.

The previous prime is 21423578908477. The next prime is 21423578908583. The reversal of 21423578908569 is 96580987532412.

It is not a de Polignac number, because 21423578908569 - 2⁷ = 21423578908441 is a prime.

It is a super-2 number, since 2×21423578908569² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21423578918569) 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 in 15 ways as a sum of consecutive naturals, for example, 2173212652 + ... + 2173222509.

It is an arithmetic number, because the mean of its divisors is an integer number (1877659989984).

It is a 1-persistent number, because it is pandigital, but 2⋅21423578908569 = 42847157817138 is not.

Almost surely, 2^{21423578908569} is an apocalyptic number.

It is an amenable number.

21423578908569 is a deficient number, since it is larger than the sum of its proper divisors (8618980931175).

21423578908569 is a wasteful number, since it uses less digits than its factorization.

21423578908569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4346435248.

The product of its (nonzero) digits is 261273600, while the sum is 69.

The spelling of 21423578908569 in words is "twenty-one trillion, four hundred twenty-three billion, five hundred seventy-eight million, nine hundred eight thousand, five hundred sixty-nine".