21558442040205 has 128 divisors (see below), whose sum is σ = 40392500428800. Its totient is φ = 9615532253184.

The previous prime is 21558442040167. The next prime is 21558442040221. The reversal of 21558442040205 is 50204024485512.

It is not a de Polignac number, because 21558442040205 - 2⁶ = 21558442040141 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1407844629 + ... + 1407859941.

It is an arithmetic number, because the mean of its divisors is an integer number (315566409600).

Almost surely, 2^{21558442040205} is an apocalyptic number.

It is an amenable number.

21558442040205 is a deficient number, since it is larger than the sum of its proper divisors (18834058388595).

21558442040205 is a wasteful number, since it uses less digits than its factorization.

21558442040205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17403.

The product of its (nonzero) digits is 512000, while the sum is 42.

The spelling of 21558442040205 in words is "twenty-one trillion, five hundred fifty-eight billion, four hundred forty-two million, forty thousand, two hundred five".