21202022220121 has 2 divisors, whose sum is σ = 21202022220122. Its totient is φ = 21202022220120.

The previous prime is 21202022220089. The next prime is 21202022220131. The reversal of 21202022220121 is 12102222020212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20131912659600 + 1070109560521 = 4486860^2 + 1034461^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202022220121 - 2⁵ = 21202022220089 is a prime.

It is not a weakly prime, because it can be changed into another prime (21202022220131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601011110060 + 10601011110061.

It is an arithmetic number, because the mean of its divisors is an integer number (10601011110061).

Almost surely, 2^{21202022220121} is an apocalyptic number.

It is an amenable number.

21202022220121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202022220121 is an equidigital number, since it uses as much as digits as its factorization.

21202022220121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21202022220121 its reverse (12102222020212), we get a palindrome (33304244240333).

The spelling of 21202022220121 in words is "twenty-one trillion, two hundred two billion, twenty-two million, two hundred twenty thousand, one hundred twenty-one".