21222323212 has 24 divisors (see below), whose sum is σ = 37569823200. Its totient is φ = 10488441600.

The previous prime is 21222323207. The next prime is 21222323267. The reversal of 21222323212 is 21232322212.

It is an unprimeable number.

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, 198148 + ... + 285844.

It is an arithmetic number, because the mean of its divisors is an integer number (1565409300).

Almost surely, 2^21222323212 is an apocalyptic number.

It is an amenable number.

21222323212 is a deficient number, since it is larger than the sum of its proper divisors (16347499988).

21222323212 is a wasteful number, since it uses less digits than its factorization.

21222323212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88401 (or 88399 counting only the distinct ones).

The product of its digits is 1152, while the sum is 22.

Adding to 21222323212 its reverse (21232322212), we get a palindrome (42454645424).

The spelling of 21222323212 in words is "twenty-one billion, two hundred twenty-two million, three hundred twenty-three thousand, two hundred twelve".