21423578822559 has 28 divisors (see below), whose sum is σ = 32121057050992. Its totient is φ = 14282215747200.

The previous prime is 21423578822549. The next prime is 21423578822579. The reversal of 21423578822559 is 95522887532412.

21423578822559 is a `hidden beast` number, since 2 + 1 + 4 + 2 + 3 + 5 + 78 + 8 + 2 + 2 + 559 = 666.

It is not a de Polignac number, because 21423578822559 - 2¹⁵ = 21423578789791 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21423578822496 and 21423578822505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423578822549) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 101722254 + ... + 101932644.

It is an arithmetic number, because the mean of its divisors is an integer number (1147180608964).

Almost surely, 2^{21423578822559} is an apocalyptic number.

21423578822559 is a deficient number, since it is larger than the sum of its proper divisors (10697478228433).

21423578822559 is an equidigital number, since it uses as much as digits as its factorization.

21423578822559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350090 (or 350075 counting only the distinct ones).

The product of its digits is 96768000, while the sum is 63.

The spelling of 21423578822559 in words is "twenty-one trillion, four hundred twenty-three billion, five hundred seventy-eight million, eight hundred twenty-two thousand, five hundred fifty-nine".