21203022321 has 16 divisors (see below), whose sum is σ = 33828184320. Its totient is φ = 13048013520.

The previous prime is 21203022299. The next prime is 21203022341. The reversal of 21203022321 is 12322030212.

21203022321 is a `hidden beast` number, since 21 + 20 + 302 + 2 + 321 = 666.

It is not a de Polignac number, because 21203022321 - 2¹⁹ = 21202498033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21203022294 and 21203022303.

It is not an unprimeable number, because it can be changed into a prime (21203022341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30203385 + ... + 30204086.

It is an arithmetic number, because the mean of its divisors is an integer number (2114261520).

Almost surely, 2^21203022321 is an apocalyptic number.

It is an amenable number.

21203022321 is a deficient number, since it is larger than the sum of its proper divisors (12625161999).

21203022321 is a wasteful number, since it uses less digits than its factorization.

21203022321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60407493 (or 60407487 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21203022321 its reverse (12322030212), we get a palindrome (33525052533).

The spelling of 21203022321 in words is "twenty-one billion, two hundred three million, twenty-two thousand, three hundred twenty-one".