21438904241673 has 96 divisors (see below), whose sum is σ = 33649560502272. Its totient is φ = 13125881260800.

The previous prime is 21438904241597. The next prime is 21438904241687. The reversal of 21438904241673 is 37614240983412.

21438904241673 is a `hidden beast` number, since 2 + 1 + 4 + 38 + 90 + 42 + 416 + 73 = 666.

It is not a de Polignac number, because 21438904241673 - 2³⁰ = 21437830499849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21438904741673) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 77109918 + ... + 77387448.

It is an arithmetic number, because the mean of its divisors is an integer number (350516255232).

Almost surely, 2^{21438904241673} is an apocalyptic number.

It is an amenable number.

21438904241673 is a deficient number, since it is larger than the sum of its proper divisors (12210656260599).

21438904241673 is a wasteful number, since it uses less digits than its factorization.

21438904241673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277795 (or 277792 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 54.

The spelling of 21438904241673 in words is "twenty-one trillion, four hundred thirty-eight billion, nine hundred four million, two hundred forty-one thousand, six hundred seventy-three".