21120122021012 has 72 divisors (see below), whose sum is σ = 44160228655200. Its totient is φ = 8806112271936.

The previous prime is 21120122020999. The next prime is 21120122021017. The reversal of 21120122021012 is 21012022102112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120122021017) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 91688039 + ... + 91918097.

It is an arithmetic number, because the mean of its divisors is an integer number (613336509100).

Almost surely, 2^{21120122021012} 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 21120122021012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22080114327600).

21120122021012 is an abundant number, since it is smaller than the sum of its proper divisors (23040106634188).

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

21120122021012 is a wasteful number, since it uses less digits than its factorization.

21120122021012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242773 (or 242764 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21120122021012 its reverse (21012022102112), we get a palindrome (42132144123124).

The spelling of 21120122021012 in words is "twenty-one trillion, one hundred twenty billion, one hundred twenty-two million, twenty-one thousand, twelve".