21120012122244 has 144 divisors (see below), whose sum is σ = 58831329251520. Its totient is φ = 5876345180160.

The previous prime is 21120012122221. The next prime is 21120012122257. The reversal of 21120012122244 is 44222121002112.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12386292 + ... + 13987860.

It is an arithmetic number, because the mean of its divisors is an integer number (408550897580).

Almost surely, 2^{21120012122244} 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 21120012122244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29415664625760).

21120012122244 is an abundant number, since it is smaller than the sum of its proper divisors (37711317129276).

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

21120012122244 is a wasteful number, since it uses less digits than its factorization.

21120012122244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1602178 (or 1602169 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 21120012122244 its reverse (44222121002112), we get a palindrome (65342133124356).

The spelling of 21120012122244 in words is "twenty-one trillion, one hundred twenty billion, twelve million, one hundred twenty-two thousand, two hundred forty-four".