21220202312 has 16 divisors (see below), whose sum is σ = 39952977900. Its totient is φ = 10566074880.

The previous prime is 21220202303. The next prime is 21220202323. The reversal of 21220202312 is 21320202212.

It can be written as a sum of positive squares in 2 ways, for example, as 20319362116 + 900840196 = 142546^2 + 30014^2 .

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, 5501237 + ... + 5505092.

Almost surely, 2^21220202312 is an apocalyptic number.

It is an amenable number.

21220202312 is a deficient number, since it is larger than the sum of its proper divisors (18732775588).

21220202312 is a wasteful number, since it uses less digits than its factorization.

21220202312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11006576 (or 11006572 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21220202312 its reverse (21320202212), we get a palindrome (42540404524).

The spelling of 21220202312 in words is "twenty-one billion, two hundred twenty million, two hundred two thousand, three hundred twelve".