12020121020 has 24 divisors (see below), whose sum is σ = 25284420000. Its totient is φ = 4800016832.

The previous prime is 12020121013. The next prime is 12020121073. The reversal of 12020121020 is 2012102021.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 12020120992 and 12020121010.

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, 489695 + ... + 513654.

It is an arithmetic number, because the mean of its divisors is an integer number (1053517500).

Almost surely, 2^12020121020 is an apocalyptic number.

12020121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12020121020 is an abundant number, since it is smaller than the sum of its proper divisors (13264298980).

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

12020121020 is a wasteful number, since it uses less digits than its factorization.

12020121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003957 (or 1003955 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 12020121020 its reverse (2012102021), we get a palindrome (14032223041).

The spelling of 12020121020 in words is "twelve billion, twenty million, one hundred twenty-one thousand, twenty".