212121201020 has 48 divisors (see below), whose sum is σ = 446420757888. Its totient is φ = 84664619520.

The previous prime is 212121200971. The next prime is 212121201023. The reversal of 212121201020 is 20102121212.

212121201020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 212121200986 and 212121201004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121201023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23297789 + ... + 23306891.

It is an arithmetic number, because the mean of its divisors is an integer number (9300432456).

Almost surely, 2^212121201020 is an apocalyptic number.

212121201020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212121201020 is an abundant number, since it is smaller than the sum of its proper divisors (234299556868).

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

212121201020 is a wasteful number, since it uses less digits than its factorization.

212121201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11510 (or 11508 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 212121201020 its reverse (20102121212), we get a palindrome (232223322232).

The spelling of 212121201020 in words is "two hundred twelve billion, one hundred twenty-one million, two hundred one thousand, twenty".