121211302424221 has 2 divisors, whose sum is σ = 121211302424222. Its totient is φ = 121211302424220.

The previous prime is 121211302424209. The next prime is 121211302424263. The reversal of 121211302424221 is 122424203112121.

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., 78223216783321 + 42988085640900 = 8844389^2 + 6556530^2 .

It is a cyclic number.

It is not a de Polignac number, because 121211302424221 - 2²³ = 121211294035613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121211302424221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121211308424221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605651212110 + 60605651212111.

It is an arithmetic number, because the mean of its divisors is an integer number (60605651212111).

Almost surely, 2^{121211302424221} is an apocalyptic number.

It is an amenable number.

121211302424221 is a deficient number, since it is larger than the sum of its proper divisors (1).

121211302424221 is an equidigital number, since it uses as much as digits as its factorization.

121211302424221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 28.

Adding to 121211302424221 its reverse (122424203112121), we get a palindrome (243635505536342).

The spelling of 121211302424221 in words is "one hundred twenty-one trillion, two hundred eleven billion, three hundred two million, four hundred twenty-four thousand, two hundred twenty-one".