21438904241678 has 32 divisors (see below), whose sum is σ = 40093765579008. Its totient is φ = 8352771840000.

The previous prime is 21438904241597. The next prime is 21438904241687. The reversal of 21438904241678 is 87614240983412.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39137678 + ... + 39681678.

It is an arithmetic number, because the mean of its divisors is an integer number (1252930174344).

Almost surely, 2^{21438904241678} is an apocalyptic number.

21438904241678 is a deficient number, since it is larger than the sum of its proper divisors (18654861337330).

21438904241678 is a wasteful number, since it uses less digits than its factorization.

21438904241678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799928.

The product of its (nonzero) digits is 18579456, while the sum is 59.

The spelling of 21438904241678 in words is "twenty-one trillion, four hundred thirty-eight billion, nine hundred four million, two hundred forty-one thousand, six hundred seventy-eight".