121313252543 has 16 divisors (see below), whose sum is σ = 153181808640. Its totient is φ = 93611101056.

The previous prime is 121313252539. The next prime is 121313252549. The reversal of 121313252543 is 345252313121.

It is not a de Polignac number, because 121313252543 - 2² = 121313252539 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121313252549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22158983 + ... + 22164456.

It is an arithmetic number, because the mean of its divisors is an integer number (9573863040).

Almost surely, 2^121313252543 is an apocalyptic number.

121313252543 is a deficient number, since it is larger than the sum of its proper divisors (31868556097).

121313252543 is a wasteful number, since it uses less digits than its factorization.

121313252543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44323486.

The product of its digits is 21600, while the sum is 32.

Adding to 121313252543 its reverse (345252313121), we get a palindrome (466565565664).

The spelling of 121313252543 in words is "one hundred twenty-one billion, three hundred thirteen million, two hundred fifty-two thousand, five hundred forty-three".