121222210210021 has 2 divisors, whose sum is σ = 121222210210022. Its totient is φ = 121222210210020.

The previous prime is 121222210209959. The next prime is 121222210210163. The reversal of 121222210210021 is 120012012222121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103660620880996 + 17561589329025 = 10181386^2 + 4190655^2 .

It is a cyclic number.

It is not a de Polignac number, because 121222210210021 - 2¹⁵ = 121222210177253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121222210210921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60611105105010 + 60611105105011.

It is an arithmetic number, because the mean of its divisors is an integer number (60611105105011).

Almost surely, 2^{121222210210021} is an apocalyptic number.

It is an amenable number.

121222210210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121222210210021 is an equidigital number, since it uses as much as digits as its factorization.

121222210210021 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 121222210210021 its reverse (120012012222121), we get a palindrome (241234222432142).

The spelling of 121222210210021 in words is "one hundred twenty-one trillion, two hundred twenty-two billion, two hundred ten million, two hundred ten thousand, twenty-one".