12121222020 has 96 divisors (see below), whose sum is σ = 35962932096. Its totient is φ = 3039897600.

The previous prime is 12121222013. The next prime is 12121222063. The reversal of 12121222020 is 2022212121.

12121222020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1649755 + ... + 1657085.

It is an arithmetic number, because the mean of its divisors is an integer number (374613876).

Almost surely, 2^12121222020 is an apocalyptic number.

12121222020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12121222020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17981466048).

12121222020 is an abundant number, since it is smaller than the sum of its proper divisors (23841710076).

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

12121222020 is a wasteful number, since it uses less digits than its factorization.

12121222020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8981 (or 8979 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 12121222020 its reverse (2022212121), we get a palindrome (14143434141).

The spelling of 12121222020 in words is "twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, twenty".