121510351399 has 2 divisors, whose sum is σ = 121510351400. Its totient is φ = 121510351398.

The previous prime is 121510351397. The next prime is 121510351507. The reversal of 121510351399 is 993153015121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121510351399 - 2¹ = 121510351397 is a prime.

It is a super-2 number, since 2×121510351399² (a number of 23 digits) contains 22 as substring.

Together with 121510351397, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121510351397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60755175699 + 60755175700.

It is an arithmetic number, because the mean of its divisors is an integer number (60755175700).

Almost surely, 2^121510351399 is an apocalyptic number.

121510351399 is a deficient number, since it is larger than the sum of its proper divisors (1).

121510351399 is an equidigital number, since it uses as much as digits as its factorization.

121510351399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36450, while the sum is 40.

The spelling of 121510351399 in words is "one hundred twenty-one billion, five hundred ten million, three hundred fifty-one thousand, three hundred ninety-nine".