20321100212 has 96 divisors (see below), whose sum is σ = 43624417536. Its totient is φ = 8084736000.

The previous prime is 20321100203. The next prime is 20321100287. The reversal of 20321100212 is 21200112302.

It is a happy number.

It is a super-2 number, since 2×20321100212² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15912518 + ... + 15913794.

It is an arithmetic number, because the mean of its divisors is an integer number (454421016).

Almost surely, 2^20321100212 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 20321100212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21812208768).

20321100212 is an abundant number, since it is smaller than the sum of its proper divisors (23303317324).

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

20321100212 is a wasteful number, since it uses less digits than its factorization.

20321100212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737 (or 1735 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20321100212 its reverse (21200112302), we get a palindrome (41521212514).

The spelling of 20321100212 in words is "twenty billion, three hundred twenty-one million, one hundred thousand, two hundred twelve".