12021212020 has 12 divisors (see below), whose sum is σ = 25244545284. Its totient is φ = 4808484800.

The previous prime is 12021212009. The next prime is 12021212029. The reversal of 12021212020 is 2021212021.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7347575524 + 4673636496 = 85718^2 + 68364^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021212029) 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, 300530281 + ... + 300530320.

It is an arithmetic number, because the mean of its divisors is an integer number (2103712107).

Almost surely, 2^12021212020 is an apocalyptic number.

12021212020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021212020 is an abundant number, since it is smaller than the sum of its proper divisors (13223333264).

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

12021212020 is a wasteful number, since it uses less digits than its factorization.

12021212020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601060610 (or 601060608 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 12021212020 its reverse (2021212021), we get a palindrome (14042424041).

Subtracting from 12021212020 its reverse (2021212021), we obtain a palindrome (9999999999).

The spelling of 12021212020 in words is "twelve billion, twenty-one million, two hundred twelve thousand, twenty".