21222042321 has 8 divisors (see below), whose sum is σ = 28311688224. Its totient is φ = 14140212320.

The previous prime is 21222042311. The next prime is 21222042323. The reversal of 21222042321 is 12324022212.

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 21222042321 - 2¹⁰ = 21222041297 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21222042323) 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 7 ways as a sum of consecutive naturals, for example, 1947636 + ... + 1958501.

It is an arithmetic number, because the mean of its divisors is an integer number (3538961028).

Almost surely, 2^21222042321 is an apocalyptic number.

It is an amenable number.

21222042321 is a deficient number, since it is larger than the sum of its proper divisors (7089645903).

21222042321 is a wasteful number, since it uses less digits than its factorization.

21222042321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3907951.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21222042321 its reverse (12324022212), we get a palindrome (33546064533).

It can be divided in two parts, 212220 and 42321, that added together give a triangular number (254541 = T₇₁₃).

The spelling of 21222042321 in words is "twenty-one billion, two hundred twenty-two million, forty-two thousand, three hundred twenty-one".