21220132231312 has 120 divisors (see below), whose sum is σ = 48620791507680. Its totient is φ = 8944528158720.

The previous prime is 21220132231307. The next prime is 21220132231367. The reversal of 21220132231312 is 21313223102212.

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 23 ways as a sum of consecutive naturals, for example, 10750512 + ... + 12570352.

It is an arithmetic number, because the mean of its divisors is an integer number (405173262564).

Almost surely, 2^{21220132231312} 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 21220132231312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24310395753840).

21220132231312 is an abundant number, since it is smaller than the sum of its proper divisors (27400659276368).

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

21220132231312 is a wasteful number, since it uses less digits than its factorization.

21220132231312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820109 (or 1820096 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21220132231312 its reverse (21313223102212), we get a palindrome (42533355333524).

The spelling of 21220132231312 in words is "twenty-one trillion, two hundred twenty billion, one hundred thirty-two million, two hundred thirty-one thousand, three hundred twelve".