20201122210121 has 2 divisors, whose sum is σ = 20201122210122. Its totient is φ = 20201122210120.

The previous prime is 20201122210103. The next prime is 20201122210123. The reversal of 20201122210121 is 12101222110202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17289795610000 + 2911326600121 = 4158100^2 + 1706261^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201122210121 - 2¹⁸ = 20201121947977 is a prime.

Together with 20201122210123, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20201122210121.

It is not a weakly prime, because it can be changed into another prime (20201122210123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100561105060 + 10100561105061.

It is an arithmetic number, because the mean of its divisors is an integer number (10100561105061).

Almost surely, 2^{20201122210121} is an apocalyptic number.

It is an amenable number.

20201122210121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201122210121 is an equidigital number, since it uses as much as digits as its factorization.

20201122210121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20201122210121 its reverse (12101222110202), we get a palindrome (32302344320323).

The spelling of 20201122210121 in words is "twenty trillion, two hundred one billion, one hundred twenty-two million, two hundred ten thousand, one hundred twenty-one".