21541231525255 has 24 divisors (see below), whose sum is σ = 29380165117632. Its totient is φ = 15070140904896.

The previous prime is 21541231525249. The next prime is 21541231525259. The reversal of 21541231525255 is 55252513214512.

It is not a de Polignac number, because 21541231525255 - 2²⁵ = 21541197970823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21541231525259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 458984239 + ... + 459031168.

It is an arithmetic number, because the mean of its divisors is an integer number (1224173546568).

Almost surely, 2^{21541231525255} is an apocalyptic number.

21541231525255 is a deficient number, since it is larger than the sum of its proper divisors (7838933592377).

21541231525255 is a wasteful number, since it uses less digits than its factorization.

21541231525255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918015463 (or 918015444 counting only the distinct ones).

The product of its digits is 600000, while the sum is 43.

Adding to 21541231525255 its reverse (55252513214512), we get a palindrome (76793744739767).

The spelling of 21541231525255 in words is "twenty-one trillion, five hundred forty-one billion, two hundred thirty-one million, five hundred twenty-five thousand, two hundred fifty-five".