21455993041 has 24 divisors (see below), whose sum is σ = 26257392000. Its totient is φ = 17455654944.

The previous prime is 21455992981. The next prime is 21455993047. The reversal of 21455993041 is 14039955412.

It is not a de Polignac number, because 21455993041 - 2⁹ = 21455992529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21455993047) 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 23 ways as a sum of consecutive naturals, for example, 44121 + ... + 211798.

It is an arithmetic number, because the mean of its divisors is an integer number (1094058000).

Almost surely, 2^21455993041 is an apocalyptic number.

It is an amenable number.

21455993041 is a deficient number, since it is larger than the sum of its proper divisors (4801398959).

21455993041 is a wasteful number, since it uses less digits than its factorization.

21455993041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256021 (or 256014 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 21455993041 in words is "twenty-one billion, four hundred fifty-five million, nine hundred ninety-three thousand, forty-one".