12021012020 has 24 divisors (see below), whose sum is σ = 25399004064. Its totient is φ = 4778904096.

The previous prime is 12021012019. The next prime is 12021012079. The reversal of 12021012020 is 2021012021.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 12021011992 and 12021012010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1840454 + ... + 1846973.

It is an arithmetic number, because the mean of its divisors is an integer number (1058291836).

Almost surely, 2^12021012020 is an apocalyptic number.

12021012020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021012020 is an abundant number, since it is smaller than the sum of its proper divisors (13377992044).

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

12021012020 is a wasteful number, since it uses less digits than its factorization.

12021012020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3687599 (or 3687597 counting only the distinct ones).

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

Adding to 12021012020 its reverse (2021012021), we get a palindrome (14042024041).

Subtracting from 12021012020 its reverse (2021012021), we obtain a palindrome (9999999999).

The spelling of 12021012020 in words is "twelve billion, twenty-one million, twelve thousand, twenty".