121210021112221 has 2 divisors, whose sum is σ = 121210021112222. Its totient is φ = 121210021112220.

The previous prime is 121210021112203. The next prime is 121210021112261. The reversal of 121210021112221 is 122211120012121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98290152111321 + 22919869000900 = 9914139^2 + 4787470^2 .

It is a cyclic number.

It is not a de Polignac number, because 121210021112221 - 2⁹ = 121210021111709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121210021112261) 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, 60605010556110 + 60605010556111.

It is an arithmetic number, because the mean of its divisors is an integer number (60605010556111).

Almost surely, 2^{121210021112221} is an apocalyptic number.

It is an amenable number.

121210021112221 is a deficient number, since it is larger than the sum of its proper divisors (1).

121210021112221 is an equidigital number, since it uses as much as digits as its factorization.

121210021112221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121210021112221 its reverse (122211120012121), we get a palindrome (243421141124342).

The spelling of 121210021112221 in words is "one hundred twenty-one trillion, two hundred ten billion, twenty-one million, one hundred twelve thousand, two hundred twenty-one".