121340353517 has 2 divisors, whose sum is σ = 121340353518. Its totient is φ = 121340353516.

The previous prime is 121340353483. The next prime is 121340353553. The reversal of 121340353517 is 715353043121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120427044676 + 913308841 = 347026^2 + 30221^2 .

It is a cyclic number.

It is not a de Polignac number, because 121340353517 - 2¹⁴ = 121340337133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121340053517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60670176758 + 60670176759.

It is an arithmetic number, because the mean of its divisors is an integer number (60670176759).

Almost surely, 2^121340353517 is an apocalyptic number.

It is an amenable number.

121340353517 is a deficient number, since it is larger than the sum of its proper divisors (1).

121340353517 is an equidigital number, since it uses as much as digits as its factorization.

121340353517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 35.

Adding to 121340353517 its reverse (715353043121), we get a palindrome (836693396638).

The spelling of 121340353517 in words is "one hundred twenty-one billion, three hundred forty million, three hundred fifty-three thousand, five hundred seventeen".