121243510613 has 2 divisors, whose sum is σ = 121243510614. Its totient is φ = 121243510612.

The previous prime is 121243510607. The next prime is 121243510627. The reversal of 121243510613 is 316015342121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72844390609 + 48399120004 = 269897^2 + 219998^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121243510613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121243512613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60621755306 + 60621755307.

It is an arithmetic number, because the mean of its divisors is an integer number (60621755307).

Almost surely, 2^121243510613 is an apocalyptic number.

It is an amenable number.

121243510613 is a deficient number, since it is larger than the sum of its proper divisors (1).

121243510613 is an equidigital number, since it uses as much as digits as its factorization.

121243510613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

Adding to 121243510613 its reverse (316015342121), we get a palindrome (437258852734).

The spelling of 121243510613 in words is "one hundred twenty-one billion, two hundred forty-three million, five hundred ten thousand, six hundred thirteen".