212121002020 has 12 divisors (see below), whose sum is σ = 445454104284. Its totient is φ = 84848400800.

The previous prime is 212121002011. The next prime is 212121002033. The reversal of 212121002020 is 20200121212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 169078860864 + 43042141156 = 411192^2 + 207466^2 .

It is a super-3 number, since 3×212121002020³ (a number of 35 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5303025031 + ... + 5303025070.

It is an arithmetic number, because the mean of its divisors is an integer number (37121175357).

Almost surely, 2^212121002020 is an apocalyptic number.

212121002020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212121002020 is an abundant number, since it is smaller than the sum of its proper divisors (233333102264).

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

212121002020 is a wasteful number, since it uses less digits than its factorization.

212121002020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10606050110 (or 10606050108 counting only the distinct ones).

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

Adding to 212121002020 its reverse (20200121212), we get a palindrome (232321123232).

The spelling of 212121002020 in words is "two hundred twelve billion, one hundred twenty-one million, two thousand, twenty".