21044523321 has 24 divisors (see below), whose sum is σ = 31846573824. Its totient is φ = 13374456480.

The previous prime is 21044523307. The next prime is 21044523323. The reversal of 21044523321 is 12332544012.

21044523321 is a `hidden beast` number, since 2 + 104 + 4 + 523 + 32 + 1 = 666.

It is not a de Polignac number, because 21044523321 - 2¹⁰ = 21044522297 is a prime.

It is a super-2 number, since 2×21044523321² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21044523323) 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, 544206 + ... + 581591.

It is an arithmetic number, because the mean of its divisors is an integer number (1326940576).

Almost surely, 2^21044523321 is an apocalyptic number.

It is an amenable number.

21044523321 is a deficient number, since it is larger than the sum of its proper divisors (10802050503).

21044523321 is a wasteful number, since it uses less digits than its factorization.

21044523321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1125901 (or 1125898 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The spelling of 21044523321 in words is "twenty-one billion, forty-four million, five hundred twenty-three thousand, three hundred twenty-one".