12013021020 has 192 divisors, whose sum is σ = 45162464256. Its totient is φ = 2304184320.

The previous prime is 12013021001. The next prime is 12013021037. The reversal of 12013021020 is 2012031021.

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 = 12013020987 and 12013021005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 39949 + ... + 160068.

It is an arithmetic number, because the mean of its divisors is an integer number (235221168).

Almost surely, 2^12013021020 is an apocalyptic number.

12013021020 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 12013021020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22581232128).

12013021020 is an abundant number, since it is smaller than the sum of its proper divisors (33149443236).

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

12013021020 is a wasteful number, since it uses less digits than its factorization.

12013021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200060 (or 200058 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 12013021020 its reverse (2012031021), we get a palindrome (14025052041).

The spelling of 12013021020 in words is "twelve billion, thirteen million, twenty-one thousand, twenty".