121241010221 has 2 divisors, whose sum is σ = 121241010222. Its totient is φ = 121241010220.

The previous prime is 121241010203. The next prime is 121241010269. The reversal of 121241010221 is 122010142121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99429855625 + 21811154596 = 315325^2 + 147686^2 .

It is a cyclic number.

It is not a de Polignac number, because 121241010221 - 2¹⁸ = 121240748077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121241010221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121241010421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60620505110 + 60620505111.

It is an arithmetic number, because the mean of its divisors is an integer number (60620505111).

Almost surely, 2^121241010221 is an apocalyptic number.

It is an amenable number.

121241010221 is a deficient number, since it is larger than the sum of its proper divisors (1).

121241010221 is an equidigital number, since it uses as much as digits as its factorization.

121241010221 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 17.

Adding to 121241010221 its reverse (122010142121), we get a palindrome (243251152342).

The spelling of 121241010221 in words is "one hundred twenty-one billion, two hundred forty-one million, ten thousand, two hundred twenty-one".