12012121020 has 48 divisors (see below), whose sum is σ = 33640796448. Its totient is φ = 3202579200.

The previous prime is 12012121007. The next prime is 12012121039. The reversal of 12012121020 is 2012121021.

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 = 12012120987 and 12012121005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324502 + ... + 359618.

It is an arithmetic number, because the mean of its divisors is an integer number (700849926).

Almost surely, 2^12012121020 is an apocalyptic number.

12012121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12012121020 is an abundant number, since it is smaller than the sum of its proper divisors (21628675428).

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

12012121020 is a wasteful number, since it uses less digits than its factorization.

12012121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40830 (or 40828 counting only the distinct ones).

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

Adding to 12012121020 its reverse (2012121021), we get a palindrome (14024242041).

Subtracting from 12012121020 its reverse (2012121021), we obtain a palindrome (9999999999).

It can be divided in two parts, 120121 and 21020, that added together give a palindrome (141141).

The spelling of 12012121020 in words is "twelve billion, twelve million, one hundred twenty-one thousand, twenty".