20312321212 has 6 divisors (see below), whose sum is σ = 35546562128. Its totient is φ = 10156160604.

The previous prime is 20312321167. The next prime is 20312321213. The reversal of 20312321212 is 21212321302.

It is a self number, because there is not a number n which added to its sum of digits gives 20312321212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312321213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2539040148 + ... + 2539040155.

Almost surely, 2^20312321212 is an apocalyptic number.

It is an amenable number.

20312321212 is a deficient number, since it is larger than the sum of its proper divisors (15234240916).

20312321212 is a wasteful number, since it uses less digits than its factorization.

20312321212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5078080307 (or 5078080305 counting only the distinct ones).

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

Adding to 20312321212 its reverse (21212321302), we get a palindrome (41524642514).

The spelling of 20312321212 in words is "twenty billion, three hundred twelve million, three hundred twenty-one thousand, two hundred twelve".