20210222121121 has 2 divisors, whose sum is σ = 20210222121122. Its totient is φ = 20210222121120.

The previous prime is 20210222121113. The next prime is 20210222121163. The reversal of 20210222121121 is 12112122201202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15172154571025 + 5038067550096 = 3895145^2 + 2244564^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210222121121 - 2³ = 20210222121113 is a prime.

It is a super-2 number, since 2×20210222121121² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20210222121521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105111060560 + 10105111060561.

It is an arithmetic number, because the mean of its divisors is an integer number (10105111060561).

Almost surely, 2^{20210222121121} is an apocalyptic number.

It is an amenable number.

20210222121121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210222121121 is an equidigital number, since it uses as much as digits as its factorization.

20210222121121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 20210222121121 its reverse (12112122201202), we get a palindrome (32322344322323).

The spelling of 20210222121121 in words is "twenty trillion, two hundred ten billion, two hundred twenty-two million, one hundred twenty-one thousand, one hundred twenty-one".