21124040099481 has 24 divisors (see below), whose sum is σ = 33629524647264. Its totient is φ = 12670464533760.

The previous prime is 21124040099467. The next prime is 21124040099489. The reversal of 21124040099481 is 18499004042112.

21124040099481 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 40 + 40 + 0 + 99 + 481 = 666.

It is not a de Polignac number, because 21124040099481 - 2¹⁵ = 21124040066713 is a prime.

It is a super-2 number, since 2×21124040099481² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21124040099489) 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, 1099857111 + ... + 1099876316.

It is an arithmetic number, because the mean of its divisors is an integer number (1401230193636).

Almost surely, 2^{21124040099481} is an apocalyptic number.

It is an amenable number.

21124040099481 is a deficient number, since it is larger than the sum of its proper divisors (12505484547783).

21124040099481 is a wasteful number, since it uses less digits than its factorization.

21124040099481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2199733541 (or 2199733538 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 21124040099481 in words is "twenty-one trillion, one hundred twenty-four billion, forty million, ninety-nine thousand, four hundred eighty-one".