21000220022020 has 12 divisors (see below), whose sum is σ = 44100462046284. Its totient is φ = 8400088008800.

The previous prime is 21000220022003. The next prime is 21000220022083. The reversal of 21000220022020 is 2022002200012.

It can be written as a sum of positive squares in 2 ways, for example, as 16707558150144 + 4292661871876 = 4087488^2 + 2071874^2 .

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, 525005500531 + ... + 525005500570.

It is an arithmetic number, because the mean of its divisors is an integer number (3675038503857).

Almost surely, 2^{21000220022020} is an apocalyptic number.

21000220022020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000220022020 is an abundant number, since it is smaller than the sum of its proper divisors (23100242024264).

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

21000220022020 is a wasteful number, since it uses less digits than its factorization.

21000220022020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050011001110 (or 1050011001108 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 21000220022020 its reverse (2022002200012), we get a palindrome (23022222222032).

The spelling of 21000220022020 in words is "twenty-one trillion, two hundred twenty million, twenty-two thousand, twenty".