12020021220 has 48 divisors (see below), whose sum is σ = 34741744128. Its totient is φ = 3101940480.

The previous prime is 12020021203. The next prime is 12020021231. The reversal of 12020021220 is 2212002021.

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 = 12020021196 and 12020021205.

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, 3229329 + ... + 3233048.

It is an arithmetic number, because the mean of its divisors is an integer number (723786336).

Almost surely, 2^12020021220 is an apocalyptic number.

12020021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12020021220 is an abundant number, since it is smaller than the sum of its proper divisors (22721722908).

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

12020021220 is a wasteful number, since it uses less digits than its factorization.

12020021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6462420 (or 6462418 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 12020021220 its reverse (2212002021), we get a palindrome (14232023241).

The spelling of 12020021220 in words is "twelve billion, twenty million, twenty-one thousand, two hundred twenty".