121513505213 has 2 divisors, whose sum is σ = 121513505214. Its totient is φ = 121513505212.

The previous prime is 121513505177. The next prime is 121513505219. The reversal of 121513505213 is 312505315121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83057510809 + 38455994404 = 288197^2 + 196102^2 .

It is a cyclic number.

It is not a de Polignac number, because 121513505213 - 2¹² = 121513501117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121513505219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60756752606 + 60756752607.

It is an arithmetic number, because the mean of its divisors is an integer number (60756752607).

Almost surely, 2^121513505213 is an apocalyptic number.

It is an amenable number.

121513505213 is a deficient number, since it is larger than the sum of its proper divisors (1).

121513505213 is an equidigital number, since it uses as much as digits as its factorization.

121513505213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4500, while the sum is 29.

The spelling of 121513505213 in words is "one hundred twenty-one billion, five hundred thirteen million, five hundred five thousand, two hundred thirteen".