12121021020 has 48 divisors (see below), whose sum is σ = 33976430208. Its totient is φ = 3228694080.

The previous prime is 12121021007. The next prime is 12121021021. The reversal of 12121021020 is 2012012121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 12121020987 and 12121021005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121021021) 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, 56946 + ... + 165785.

It is an arithmetic number, because the mean of its divisors is an integer number (707842296).

Almost surely, 2^12121021020 is an apocalyptic number.

12121021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121021020 is an abundant number, since it is smaller than the sum of its proper divisors (21855409188).

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

12121021020 is a wasteful number, since it uses less digits than its factorization.

12121021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223650 (or 223648 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12121021020 its reverse (2012012121), we get a palindrome (14133033141).

The spelling of 12121021020 in words is "twelve billion, one hundred twenty-one million, twenty-one thousand, twenty".