21601041255 has 32 divisors (see below), whose sum is σ = 38477419200. Its totient is φ = 11497885056.

The previous prime is 21601041223. The next prime is 21601041257. The reversal of 21601041255 is 55214010612.

21601041255 is a `hidden beast` number, since 2 + 1 + 601 + 0 + 4 + 1 + 2 + 55 = 666.

It is not a de Polignac number, because 21601041255 - 2⁵ = 21601041223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21601041257) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 88464 + ... + 225893.

It is an arithmetic number, because the mean of its divisors is an integer number (1202419350).

Almost surely, 2^21601041255 is an apocalyptic number.

21601041255 is a deficient number, since it is larger than the sum of its proper divisors (16876377945).

21601041255 is a wasteful number, since it uses less digits than its factorization.

21601041255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314880 (or 314874 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 21601041255 its reverse (55214010612), we get a palindrome (76815051867).

The spelling of 21601041255 in words is "twenty-one billion, six hundred one million, forty-one thousand, two hundred fifty-five".