121012205261 has 2 divisors, whose sum is σ = 121012205262. Its totient is φ = 121012205260.

The previous prime is 121012205203. The next prime is 121012205287. The reversal of 121012205261 is 162502210121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90664823236 + 30347382025 = 301106^2 + 174205^2 .

It is an emirp because it is prime and its reverse (162502210121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121012205261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121012205201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60506102630 + 60506102631.

It is an arithmetic number, because the mean of its divisors is an integer number (60506102631).

Almost surely, 2^121012205261 is an apocalyptic number.

It is an amenable number.

121012205261 is a deficient number, since it is larger than the sum of its proper divisors (1).

121012205261 is an equidigital number, since it uses as much as digits as its factorization.

121012205261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 23.

Adding to 121012205261 its reverse (162502210121), we get a palindrome (283514415382).

The spelling of 121012205261 in words is "one hundred twenty-one billion, twelve million, two hundred five thousand, two hundred sixty-one".