21222021331 has 8 divisors (see below), whose sum is σ = 25090074720. Its totient is φ = 17563051968.

The previous prime is 21222021319. The next prime is 21222021347. The reversal of 21222021331 is 13312022212.

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

It is not a de Polignac number, because 21222021331 - 2⁹ = 21222020819 is a prime.

It is a super-2 number, since 2×21222021331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21222021299 and 21222021308.

It is not an unprimeable number, because it can be changed into a prime (21222021311) 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, 52270786 + ... + 52271191.

It is an arithmetic number, because the mean of its divisors is an integer number (3136259340).

Almost surely, 2^21222021331 is an apocalyptic number.

21222021331 is a deficient number, since it is larger than the sum of its proper divisors (3868053389).

21222021331 is a wasteful number, since it uses less digits than its factorization.

21222021331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104542013.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21222021331 its reverse (13312022212), we get a palindrome (34534043543).

The spelling of 21222021331 in words is "twenty-one billion, two hundred twenty-two million, twenty-one thousand, three hundred thirty-one".