21312031222 has 8 divisors (see below), whose sum is σ = 31971204576. Its totient is φ = 10654963032.

The previous prime is 21312031217. The next prime is 21312031229. The reversal of 21312031222 is 22213021312.

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

It is a super-3 number, since 3×21312031222³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21312031222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312031229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500733 + ... + 541624.

It is an arithmetic number, because the mean of its divisors is an integer number (3996400572).

Almost surely, 2^21312031222 is an apocalyptic number.

21312031222 is a deficient number, since it is larger than the sum of its proper divisors (10659173354).

21312031222 is a wasteful number, since it uses less digits than its factorization.

21312031222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052582.

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

Adding to 21312031222 its reverse (22213021312), we get a palindrome (43525052534).

The spelling of 21312031222 in words is "twenty-one billion, three hundred twelve million, thirty-one thousand, two hundred twenty-two".