20321222012 has 24 divisors (see below), whose sum is σ = 43768786656. Its totient is φ = 8039164608.

The previous prime is 20321222011. The next prime is 20321222023. The reversal of 20321222012 is 21022212302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321222011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27913403 + ... + 27914130.

It is an arithmetic number, because the mean of its divisors is an integer number (1823699444).

Almost surely, 2^20321222012 is an apocalyptic number.

It is an amenable number.

20321222012 is an abundant number, since it is smaller than the sum of its proper divisors (23447564644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20321222012 is a wasteful number, since it uses less digits than its factorization.

20321222012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55827557 (or 55827555 counting only the distinct ones).

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

Adding to 20321222012 its reverse (21022212302), we get a palindrome (41343434314).

The spelling of 20321222012 in words is "twenty billion, three hundred twenty-one million, two hundred twenty-two thousand, twelve".