21212012201020 has 24 divisors (see below), whose sum is σ = 44546813791200. Its totient is φ = 8484502372032.

The previous prime is 21212012200933. The next prime is 21212012201021. The reversal of 21212012201020 is 2010221021212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21212012200985 and 21212012201003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212012201021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18331360 + ... + 19454119.

It is an arithmetic number, because the mean of its divisors is an integer number (1856117241300).

Almost surely, 2^{21212012201020} is an apocalyptic number.

21212012201020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212012201020 is an abundant number, since it is smaller than the sum of its proper divisors (23334801590180).

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

21212012201020 is a wasteful number, since it uses less digits than its factorization.

21212012201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37813557 (or 37813555 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21212012201020 its reverse (2010221021212), we get a palindrome (23222233222232).

The spelling of 21212012201020 in words is "twenty-one trillion, two hundred twelve billion, twelve million, two hundred one thousand, twenty".