21546134403025 has 12 divisors (see below), whose sum is σ = 26724756135600. Its totient is φ = 17232036892880.

The previous prime is 21546134403023. The next prime is 21546134403071. The reversal of 21546134403025 is 52030443164512.

It is not a de Polignac number, because 21546134403025 - 2¹ = 21546134403023 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21546134403023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121675495 + ... + 121852444.

It is an arithmetic number, because the mean of its divisors is an integer number (2227063011300).

Almost surely, 2^{21546134403025} is an apocalyptic number.

21546134403025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21546134403025 is a deficient number, since it is larger than the sum of its proper divisors (5178621732575).

21546134403025 is a wasteful number, since it uses less digits than its factorization.

21546134403025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243531488 (or 243531483 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 40.

Adding to 21546134403025 its reverse (52030443164512), we get a palindrome (73576577567537).

The spelling of 21546134403025 in words is "twenty-one trillion, five hundred forty-six billion, one hundred thirty-four million, four hundred three thousand, twenty-five".