121231300013261 has 2 divisors, whose sum is σ = 121231300013262. Its totient is φ = 121231300013260.

The previous prime is 121231300013251. The next prime is 121231300013477. The reversal of 121231300013261 is 162310003132121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120826943921161 + 404356092100 = 10992131^2 + 635890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121231300013261 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121231300013261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121231300013251) 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, 60615650006630 + 60615650006631.

It is an arithmetic number, because the mean of its divisors is an integer number (60615650006631).

Almost surely, 2^{121231300013261} is an apocalyptic number.

It is an amenable number.

121231300013261 is a deficient number, since it is larger than the sum of its proper divisors (1).

121231300013261 is an equidigital number, since it uses as much as digits as its factorization.

121231300013261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

Adding to 121231300013261 its reverse (162310003132121), we get a palindrome (283541303145382).

The spelling of 121231300013261 in words is "one hundred twenty-one trillion, two hundred thirty-one billion, three hundred million, thirteen thousand, two hundred sixty-one".