21530541134225 has 48 divisors (see below), whose sum is σ = 28030989235200. Its totient is φ = 16383777120000.

The previous prime is 21530541134189. The next prime is 21530541134243. The reversal of 21530541134225 is 52243114503512.

It is not a de Polignac number, because 21530541134225 - 2³⁴ = 21513361265041 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 65974955 + ... + 66300495.

It is an arithmetic number, because the mean of its divisors is an integer number (583978942400).

Almost surely, 2^{21530541134225} is an apocalyptic number.

21530541134225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21530541134225 is a deficient number, since it is larger than the sum of its proper divisors (6500448100975).

21530541134225 is a wasteful number, since it uses less digits than its factorization.

21530541134225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327042 (or 327037 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 38.

Adding to 21530541134225 its reverse (52243114503512), we get a palindrome (73773655637737).

The spelling of 21530541134225 in words is "twenty-one trillion, five hundred thirty billion, five hundred forty-one million, one hundred thirty-four thousand, two hundred twenty-five".