21022220021020 has 24 divisors (see below), whose sum is σ = 44148434413104. Its totient is φ = 8408550414336.

The previous prime is 21022220020961. The next prime is 21022220021039. The reversal of 21022220021020 is 2012002222012.

21022220021020 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×21022220021020² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21022220020985 and 21022220021003.

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, 20588709 + ... + 21585628.

It is an arithmetic number, because the mean of its divisors is an integer number (1839518100546).

Almost surely, 2^{21022220021020} is an apocalyptic number.

21022220021020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022220021020 is an abundant number, since it is smaller than the sum of its proper divisors (23126214392084).

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

21022220021020 is a wasteful number, since it uses less digits than its factorization.

21022220021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42199269 (or 42199267 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21022220021020 its reverse (2012002222012), we get a palindrome (23034222243032).

The spelling of 21022220021020 in words is "twenty-one trillion, twenty-two billion, two hundred twenty million, twenty-one thousand, twenty".