22020020202121 has 4 divisors (see below), whose sum is σ = 22214887637652. Its totient is φ = 21825152766592.

The previous prime is 22020020202109. The next prime is 22020020202127. The reversal of 22020020202121 is 12120202002022.

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 9282716030025 + 12737304172096 = 3046755^2 + 3568936^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22020020202121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22020020202095 and 22020020202104.

It is not an unprimeable number, because it can be changed into a prime (22020020202127) 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, 97433717596 + ... + 97433717821.

It is an arithmetic number, because the mean of its divisors is an integer number (5553721909413).

Almost surely, 2^{22020020202121} is an apocalyptic number.

It is an amenable number.

22020020202121 is a deficient number, since it is larger than the sum of its proper divisors (194867435531).

22020020202121 is a wasteful number, since it uses less digits than its factorization.

22020020202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194867435530.

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

Adding to 22020020202121 its reverse (12120202002022), we get a palindrome (34140222204143).

The spelling of 22020020202121 in words is "twenty-two trillion, twenty billion, twenty million, two hundred two thousand, one hundred twenty-one".