22121020212020 has 24 divisors (see below), whose sum is σ = 49186739060424. Its totient is φ = 8327913491456.

The previous prime is 22121020212019. The next prime is 22121020212023. The reversal of 22121020212020 is 2021202012122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10144811048464 + 11976209163556 = 3185092^2 + 3460666^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 22121020212020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121020212023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32530911737 + ... + 32530912416.

It is an arithmetic number, because the mean of its divisors is an integer number (2049447460851).

Almost surely, 2^{22121020212020} is an apocalyptic number.

22121020212020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121020212020 is an abundant number, since it is smaller than the sum of its proper divisors (27065718848404).

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

22121020212020 is a wasteful number, since it uses less digits than its factorization.

22121020212020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65061824179 (or 65061824177 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22121020212020 its reverse (2021202012122), we get a palindrome (24142222224142).

The spelling of 22121020212020 in words is "twenty-two trillion, one hundred twenty-one billion, twenty million, two hundred twelve thousand, twenty".