21120323212212 has 192 divisors, whose sum is σ = 59405900359680. Its totient is φ = 5714622144000.

The previous prime is 21120323212199. The next prime is 21120323212213. The reversal of 21120323212212 is 21221232302112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120323212213) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17950387 + ... + 19090757.

It is an arithmetic number, because the mean of its divisors is an integer number (309405731040).

Almost surely, 2^{21120323212212} 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 21120323212212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29702950179840).

21120323212212 is an abundant number, since it is smaller than the sum of its proper divisors (38285577147468).

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

21120323212212 is a wasteful number, since it uses less digits than its factorization.

21120323212212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140582 (or 1140580 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21120323212212 its reverse (21221232302112), we get a palindrome (42341555514324).

The spelling of 21120323212212 in words is "twenty-one trillion, one hundred twenty billion, three hundred twenty-three million, two hundred twelve thousand, two hundred twelve".