21022222020020 has 24 divisors (see below), whose sum is σ = 47542563645864. Its totient is φ = 7762051207296.

The previous prime is 21022222020001. The next prime is 21022222020053. The reversal of 21022222020020 is 2002022222012.

It can be written as a sum of positive squares in 4 ways, for example, as 2926692934564 + 18095529085456 = 1710758^2 + 4253884^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40427349779 + ... + 40427350298.

It is an arithmetic number, because the mean of its divisors is an integer number (1980940151911).

Almost surely, 2^{21022222020020} is an apocalyptic number.

21022222020020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022222020020 is an abundant number, since it is smaller than the sum of its proper divisors (26520341625844).

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

21022222020020 is a wasteful number, since it uses less digits than its factorization.

21022222020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80854700099 (or 80854700097 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 21022222020020 its reverse (2002022222012), we get a palindrome (23024244242032).

The spelling of 21022222020020 in words is "twenty-one trillion, twenty-two billion, two hundred twenty-two million, twenty thousand, twenty".