121315332517 has 2 divisors, whose sum is σ = 121315332518. Its totient is φ = 121315332516.

The previous prime is 121315332499. The next prime is 121315332547. The reversal of 121315332517 is 715233513121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121247418436 + 67914081 = 348206^2 + 8241^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121315332517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121315332547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60657666258 + 60657666259.

It is an arithmetic number, because the mean of its divisors is an integer number (60657666259).

Almost surely, 2^121315332517 is an apocalyptic number.

It is an amenable number.

121315332517 is a deficient number, since it is larger than the sum of its proper divisors (1).

121315332517 is an equidigital number, since it uses as much as digits as its factorization.

121315332517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18900, while the sum is 34.

Adding to 121315332517 its reverse (715233513121), we get a palindrome (836548845638).

The spelling of 121315332517 in words is "one hundred twenty-one billion, three hundred fifteen million, three hundred thirty-two thousand, five hundred seventeen".