20323221212 has 48 divisors (see below), whose sum is σ = 41823698112. Its totient is φ = 8460940800.

The previous prime is 20323221209. The next prime is 20323221277. The reversal of 20323221212 is 21212232302.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82088 + ... + 217680.

It is an arithmetic number, because the mean of its divisors is an integer number (871327044).

Almost surely, 2^20323221212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20323221212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20911849056).

20323221212 is an abundant number, since it is smaller than the sum of its proper divisors (21500476900).

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

20323221212 is a wasteful number, since it uses less digits than its factorization.

20323221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135758 (or 135756 counting only the distinct ones).

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

Adding to 20323221212 its reverse (21212232302), we get a palindrome (41535453514).

The spelling of 20323221212 in words is "twenty billion, three hundred twenty-three million, two hundred twenty-one thousand, two hundred twelve".