21321123320291 has 24 divisors (see below), whose sum is σ = 22710977696736. Its totient is φ = 20012122690560.

The previous prime is 21321123320191. The next prime is 21321123320327. The reversal of 21321123320291 is 19202332112312.

It is not a de Polignac number, because 21321123320291 - 2³⁴ = 21303943451107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21321123320191) 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, 623097815 + ... + 623132031.

It is an arithmetic number, because the mean of its divisors is an integer number (946290737364).

Almost surely, 2^{21321123320291} is an apocalyptic number.

21321123320291 is a deficient number, since it is larger than the sum of its proper divisors (1389854376445).

21321123320291 is a wasteful number, since it uses less digits than its factorization.

21321123320291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40079 (or 40062 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The spelling of 21321123320291 in words is "twenty-one trillion, three hundred twenty-one billion, one hundred twenty-three million, three hundred twenty thousand, two hundred ninety-one".