121321135213 has 2 divisors, whose sum is σ = 121321135214. Its totient is φ = 121321135212.

The previous prime is 121321135097. The next prime is 121321135231. The reversal of 121321135213 is 312531123121.

Together with next prime (121321135231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101176158724 + 20144976489 = 318082^2 + 141933^2 .

It is a cyclic number.

It is not a de Polignac number, because 121321135213 - 2¹³ = 121321127021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121321139213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60660567606 + 60660567607.

It is an arithmetic number, because the mean of its divisors is an integer number (60660567607).

Almost surely, 2^121321135213 is an apocalyptic number.

It is an amenable number.

121321135213 is a deficient number, since it is larger than the sum of its proper divisors (1).

121321135213 is an equidigital number, since it uses as much as digits as its factorization.

121321135213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 25.

Adding to 121321135213 its reverse (312531123121), we get a palindrome (433852258334).

The spelling of 121321135213 in words is "one hundred twenty-one billion, three hundred twenty-one million, one hundred thirty-five thousand, two hundred thirteen".