21454525503220 has 12 divisors (see below), whose sum is σ = 45054503556804. Its totient is φ = 8581810201280.

The previous prime is 21454525503217. The next prime is 21454525503239. The reversal of 21454525503220 is 2230552545412.

It can be written as a sum of positive squares in 2 ways, for example, as 8580810207204 + 12873715296016 = 2929302^2 + 3587996^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 536363137561 + ... + 536363137600.

It is an arithmetic number, because the mean of its divisors is an integer number (3754541963067).

Almost surely, 2^{21454525503220} is an apocalyptic number.

21454525503220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21454525503220 is an abundant number, since it is smaller than the sum of its proper divisors (23599978053584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21454525503220 is a wasteful number, since it uses less digits than its factorization.

21454525503220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072726275170 (or 1072726275168 counting only the distinct ones).

The product of its (nonzero) digits is 480000, while the sum is 40.

The spelling of 21454525503220 in words is "twenty-one trillion, four hundred fifty-four billion, five hundred twenty-five million, five hundred three thousand, two hundred twenty".