21312331222 has 32 divisors (see below), whose sum is σ = 39353477184. Its totient is φ = 8429616000.

The previous prime is 21312331171. The next prime is 21312331223. The reversal of 21312331222 is 22213321312.

It is a junction number, because it is equal to n+sod(n) for n = 21312331193 and 21312331202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312331223) 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 15 ways as a sum of consecutive naturals, for example, 1430572 + ... + 1445392.

It is an arithmetic number, because the mean of its divisors is an integer number (1229796162).

Almost surely, 2^21312331222 is an apocalyptic number.

21312331222 is a deficient number, since it is larger than the sum of its proper divisors (18041145962).

21312331222 is a wasteful number, since it uses less digits than its factorization.

21312331222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22744.

The product of its digits is 864, while the sum is 22.

Adding to 21312331222 its reverse (22213321312), we get a palindrome (43525652534).

The spelling of 21312331222 in words is "twenty-one billion, three hundred twelve million, three hundred thirty-one thousand, two hundred twenty-two".