22121120210020 has 48 divisors (see below), whose sum is σ = 50032431595440. Its totient is φ = 8167036202496.

The previous prime is 22121120209999. The next prime is 22121120210027. The reversal of 22121120210020 is 2001202112122.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 8036816765184 + 14084303444836 = 2834928^2 + 3752906^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22121120209976 and 22121120210003.

It is not an unprimeable number, because it can be changed into a prime (22121120210027) 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, 1172955 + ... + 6754114.

It is an arithmetic number, because the mean of its divisors is an integer number (1042342324905).

Almost surely, 2^{22121120210020} is an apocalyptic number.

22121120210020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121120210020 is an abundant number, since it is smaller than the sum of its proper divisors (27911311385420).

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

22121120210020 is a wasteful number, since it uses less digits than its factorization.

22121120210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7937824 (or 7937822 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22121120210020 its reverse (2001202112122), we get a palindrome (24122322322142).

The spelling of 22121120210020 in words is "twenty-two trillion, one hundred twenty-one billion, one hundred twenty million, two hundred ten thousand, twenty".