12121344020 has 24 divisors (see below), whose sum is σ = 26332576200. Its totient is φ = 4681346432.

The previous prime is 12121344013. The next prime is 12121344043. The reversal of 12121344020 is 2044312121.

It can be written as a sum of positive squares in 4 ways, for example, as 4580853124 + 7540490896 = 67682^2 + 86836^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 12121343983 and 12121344001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10448855 + ... + 10450014.

It is an arithmetic number, because the mean of its divisors is an integer number (1097190675).

Almost surely, 2^12121344020 is an apocalyptic number.

12121344020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121344020 is an abundant number, since it is smaller than the sum of its proper divisors (14211232180).

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

12121344020 is a wasteful number, since it uses less digits than its factorization.

12121344020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20898907 (or 20898905 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 12121344020 its reverse (2044312121), we get a palindrome (14165656141).

The spelling of 12121344020 in words is "twelve billion, one hundred twenty-one million, three hundred forty-four thousand, twenty".