20022201220121 has 4 divisors (see below), whose sum is σ = 20199388841652. Its totient is φ = 19845013598592.

The previous prime is 20022201220111. The next prime is 20022201220211. The reversal of 20022201220121 is 12102210222002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9395383605721 + 10626817614400 = 3065189^2 + 3259880^2 .

It is a cyclic number.

It is not a de Polignac number, because 20022201220121 - 2¹⁸ = 20022200957977 is a prime.

It is a super-2 number, since 2×20022201220121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20022201220121.

It is not an unprimeable number, because it can be changed into a prime (20022201220111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88593810596 + ... + 88593810821.

It is an arithmetic number, because the mean of its divisors is an integer number (5049847210413).

Almost surely, 2^{20022201220121} is an apocalyptic number.

It is an amenable number.

20022201220121 is a deficient number, since it is larger than the sum of its proper divisors (177187621531).

20022201220121 is a wasteful number, since it uses less digits than its factorization.

20022201220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177187621530.

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

Adding to 20022201220121 its reverse (12102210222002), we get a palindrome (32124411442123).

The spelling of 20022201220121 in words is "twenty trillion, twenty-two billion, two hundred one million, two hundred twenty thousand, one hundred twenty-one".