21255441124401 has 96 divisors (see below), whose sum is σ = 35945369913600. Its totient is φ = 12389465088000.

The previous prime is 21255441124391. The next prime is 21255441124481. The reversal of 21255441124401 is 10442114455212.

It is a happy number.

21255441124401 is a `hidden beast` number, since 2 + 1 + 2 + 55 + 441 + 124 + 40 + 1 = 666.

It is not a de Polignac number, because 21255441124401 - 2²³ = 21255432735793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21255441124481) 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 95 ways as a sum of consecutive naturals, for example, 23912476 + ... + 24785426.

It is an arithmetic number, because the mean of its divisors is an integer number (374430936600).

Almost surely, 2^{21255441124401} is an apocalyptic number.

It is an amenable number.

21255441124401 is a deficient number, since it is larger than the sum of its proper divisors (14689928789199).

21255441124401 is a wasteful number, since it uses less digits than its factorization.

21255441124401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873268 (or 873251 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 36.

Adding to 21255441124401 its reverse (10442114455212), we get a palindrome (31697555579613).

The spelling of 21255441124401 in words is "twenty-one trillion, two hundred fifty-five billion, four hundred forty-one million, one hundred twenty-four thousand, four hundred one".