21442515514205 has 8 divisors (see below), whose sum is σ = 25731162228312. Its totient is φ = 17153916670528.

The previous prime is 21442515514181. The next prime is 21442515514219. The reversal of 21442515514205 is 50241551524412.

It can be written as a sum of positive squares in 4 ways, for example, as 205413807076 + 21237101707129 = 453226^2 + 4608373^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21442515514205 - 2³⁰ = 21441441772381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10974674 + ... + 12780003.

It is an arithmetic number, because the mean of its divisors is an integer number (3216395278539).

Almost surely, 2^{21442515514205} is an apocalyptic number.

It is an amenable number.

21442515514205 is a deficient number, since it is larger than the sum of its proper divisors (4288646714107).

21442515514205 is a wasteful number, since it uses less digits than its factorization.

21442515514205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23935215.

The product of its (nonzero) digits is 320000, while the sum is 41.

The spelling of 21442515514205 in words is "twenty-one trillion, four hundred forty-two billion, five hundred fifteen million, five hundred fourteen thousand, two hundred five".