21222002321 has 8 divisors (see below), whose sum is σ = 23064139560. Its totient is φ = 19409818752.

The previous prime is 21222002303. The next prime is 21222002323. The reversal of 21222002321 is 12320022212.

It can be written as a sum of positive squares in 4 ways, for example, as 4821358096 + 16400644225 = 69436^2 + 128065^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21222002321 - 2⁶ = 21222002257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21222002321.

It is not an unprimeable number, because it can be changed into a prime (21222002323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7486940 + ... + 7489773.

It is an arithmetic number, because the mean of its divisors is an integer number (2883017445).

Almost surely, 2^21222002321 is an apocalyptic number.

It is an amenable number.

21222002321 is a deficient number, since it is larger than the sum of its proper divisors (1842137239).

21222002321 is a wasteful number, since it uses less digits than its factorization.

21222002321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14976835.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21222002321 its reverse (12320022212), we get a palindrome (33542024533).

The spelling of 21222002321 in words is "twenty-one billion, two hundred twenty-two million, two thousand, three hundred twenty-one".