12021011020 has 12 divisors (see below), whose sum is σ = 25244123184. Its totient is φ = 4808404400.

The previous prime is 12021011003. The next prime is 12021011021. The reversal of 12021011020 is 2011012021.

It is a super-2 number, since 2×12021011020² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 12021010988 and 12021011006.

It is not an unprimeable number, because it can be changed into a prime (12021011021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300525256 + ... + 300525295.

It is an arithmetic number, because the mean of its divisors is an integer number (2103676932).

Almost surely, 2^12021011020 is an apocalyptic number.

12021011020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021011020 is an abundant number, since it is smaller than the sum of its proper divisors (13223112164).

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

12021011020 is a wasteful number, since it uses less digits than its factorization.

12021011020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601050560 (or 601050558 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 12021011020 its reverse (2011012021), we get a palindrome (14032023041).

The spelling of 12021011020 in words is "twelve billion, twenty-one million, eleven thousand, twenty".