21455000532209 has 8 divisors (see below), whose sum is σ = 21676335293928. Its totient is φ = 21233668815360.

The previous prime is 21455000532083. The next prime is 21455000532271. The reversal of 21455000532209 is 90223500055412.

It can be written as a sum of positive squares in 4 ways, for example, as 2096266225 + 21452904265984 = 45785^2 + 4631728^2 .

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 21455000532209 - 2⁸ = 21455000531953 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21455000502209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15099839 + ... + 16459499.

It is an arithmetic number, because the mean of its divisors is an integer number (2709541911741).

Almost surely, 2^{21455000532209} is an apocalyptic number.

It is an amenable number.

21455000532209 is a deficient number, since it is larger than the sum of its proper divisors (221334761719).

21455000532209 is a wasteful number, since it uses less digits than its factorization.

21455000532209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522435.

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 21455000532209 in words is "twenty-one trillion, four hundred fifty-five billion, five hundred thirty-two thousand, two hundred nine".