21322313212 has 12 divisors (see below), whose sum is σ = 37683494856. Its totient is φ = 10555600400.

The previous prime is 21322313167. The next prime is 21322313219. The reversal of 21322313212 is 21231322312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322313219) 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, 26388598 + ... + 26389405.

It is an arithmetic number, because the mean of its divisors is an integer number (3140291238).

Almost surely, 2^21322313212 is an apocalyptic number.

It is an amenable number.

21322313212 is a deficient number, since it is larger than the sum of its proper divisors (16361181644).

21322313212 is a wasteful number, since it uses less digits than its factorization.

21322313212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52778108 (or 52778106 counting only the distinct ones).

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

Adding to 21322313212 its reverse (21231322312), we get a palindrome (42553635524).

The spelling of 21322313212 in words is "twenty-one billion, three hundred twenty-two million, three hundred thirteen thousand, two hundred twelve".