12122021105440 has 96 divisors (see below), whose sum is σ = 28681842060144. Its totient is φ = 4841434644480.

The previous prime is 12122021105419. The next prime is 12122021105449. The reversal of 12122021105440 is 4450112022121.

It can be written as a sum of positive squares in 8 ways, for example, as 3776601449104 + 8345419656336 = 1943348^2 + 2888844^2 .

It is not an unprimeable number, because it can be changed into a prime (12122021105449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1174495480 + ... + 1174505800.

Almost surely, 2^{12122021105440} is an apocalyptic number.

12122021105440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12122021105440 is an abundant number, since it is smaller than the sum of its proper divisors (16559820954704).

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

12122021105440 is a wasteful number, since it uses less digits than its factorization.

12122021105440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20790 (or 20782 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

Adding to 12122021105440 its reverse (4450112022121), we get a palindrome (16572133127561).

The spelling of 12122021105440 in words is "twelve trillion, one hundred twenty-two billion, twenty-one million, one hundred five thousand, four hundred forty".