21550542032325 has 24 divisors (see below), whose sum is σ = 35630484333408. Its totient is φ = 11493540210880.

The previous prime is 21550542032323. The next prime is 21550542032329. The reversal of 21550542032325 is 52323024505512.

It is not a de Polignac number, because 21550542032325 - 2¹ = 21550542032323 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21550542032323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10364842 + ... + 12269108.

It is an arithmetic number, because the mean of its divisors is an integer number (1484603513892).

Almost surely, 2^{21550542032325} is an apocalyptic number.

21550542032325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21550542032325 is a deficient number, since it is larger than the sum of its proper divisors (14079942301083).

21550542032325 is a wasteful number, since it uses less digits than its factorization.

21550542032325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2055173 (or 2055168 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 39.

Adding to 21550542032325 its reverse (52323024505512), we get a palindrome (73873566537837).

The spelling of 21550542032325 in words is "twenty-one trillion, five hundred fifty billion, five hundred forty-two million, thirty-two thousand, three hundred twenty-five".