21312203222 has 8 divisors (see below), whose sum is σ = 31981727136. Its totient is φ = 10651627512.

The previous prime is 21312203203. The next prime is 21312203287. The reversal of 21312203222 is 22230221312.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21312203194 and 21312203203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2231093 + ... + 2240624.

It is an arithmetic number, because the mean of its divisors is an integer number (3997715892).

Almost surely, 2^21312203222 is an apocalyptic number.

21312203222 is a deficient number, since it is larger than the sum of its proper divisors (10669523914).

21312203222 is a wasteful number, since it uses less digits than its factorization.

21312203222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4474102.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21312203222 its reverse (22230221312), we get a palindrome (43542424534).

The spelling of 21312203222 in words is "twenty-one billion, three hundred twelve million, two hundred three thousand, two hundred twenty-two".