21044104321221 has 48 divisors (see below), whose sum is σ = 32056157486080. Its totient is φ = 13266400320000.

The previous prime is 21044104321169. The next prime is 21044104321237. The reversal of 21044104321221 is 12212340144012.

21044104321221 is a `hidden beast` number, since 2 + 1 + 0 + 4 + 4 + 1 + 0 + 432 + 1 + 221 = 666.

It is not a de Polignac number, because 21044104321221 - 2¹⁴ = 21044104304837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044104321241) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 653710236 + ... + 653742426.

Almost surely, 2^{21044104321221} is an apocalyptic number.

It is an amenable number.

21044104321221 is a deficient number, since it is larger than the sum of its proper divisors (11012053164859).

21044104321221 is a wasteful number, since it uses less digits than its factorization.

21044104321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39178 (or 39175 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

Adding to 21044104321221 its reverse (12212340144012), we get a palindrome (33256444465233).

The spelling of 21044104321221 in words is "twenty-one trillion, forty-four billion, one hundred four million, three hundred twenty-one thousand, two hundred twenty-one".