21202020201020 has 12 divisors (see below), whose sum is σ = 44524242422184. Its totient is φ = 8480808080400.

The previous prime is 21202020201013. The next prime is 21202020201067. The reversal of 21202020201020 is 2010202020212.

It is a super-2 number, since 2×21202020201020² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21202020200986 and 21202020201004.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 530050505006 + ... + 530050505045.

It is an arithmetic number, because the mean of its divisors is an integer number (3710353535182).

Almost surely, 2^{21202020201020} is an apocalyptic number.

21202020201020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202020201020 is an abundant number, since it is smaller than the sum of its proper divisors (23322222221164).

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

21202020201020 is a wasteful number, since it uses less digits than its factorization.

21202020201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060101010060 (or 1060101010058 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21202020201020 its reverse (2010202020212), we get a palindrome (23212222221232).

The spelling of 21202020201020 in words is "twenty-one trillion, two hundred two billion, twenty million, two hundred one thousand, twenty".