21010020202020 has 48 divisors (see below), whose sum is σ = 58829007585600. Its totient is φ = 5602581480576.

The previous prime is 21010020202013. The next prime is 21010020202021. The reversal of 21010020202020 is 2020202001012.

It is a super-2 number, since 2×21010020202020² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

21010020202020 is a modest number, since divided by 20202020 gives 210100 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 21010020201987 and 21010020202005.

It is not an unprimeable number, because it can be changed into a prime (21010020202021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 953799 + ... + 6552081.

It is an arithmetic number, because the mean of its divisors is an integer number (1225604324700).

Almost surely, 2^{21010020202020} is an apocalyptic number.

21010020202020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010020202020 is an abundant number, since it is smaller than the sum of its proper divisors (37818987383580).

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

21010020202020 is a wasteful number, since it uses less digits than its factorization.

21010020202020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5660844 (or 5660842 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21010020202020 its reverse (2020202001012), we get a palindrome (23030222203032).

The spelling of 21010020202020 in words is "twenty-one trillion, ten billion, twenty million, two hundred two thousand, twenty".