21222210010312 has 8 divisors (see below), whose sum is σ = 39791643769350. Its totient is φ = 10611105005152.

The previous prime is 21222210010289. The next prime is 21222210010319. The reversal of 21222210010312 is 21301001222212.

It can be written as a sum of positive squares in only one way, i.e., 10845732677796 + 10376477332516 = 3293286^2 + 3221254^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21222210010312.

It is not an unprimeable number, because it can be changed into a prime (21222210010319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1326388125637 + ... + 1326388125652.

Almost surely, 2^{21222210010312} is an apocalyptic number.

It is an amenable number.

21222210010312 is a deficient number, since it is larger than the sum of its proper divisors (18569433759038).

21222210010312 is a wasteful number, since it uses less digits than its factorization.

21222210010312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2652776251295 (or 2652776251291 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21222210010312 its reverse (21301001222212), we get a palindrome (42523211232524).

The spelling of 21222210010312 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred ten million, ten thousand, three hundred twelve".