121303400543 has 4 divisors (see below), whose sum is σ = 130634431368. Its totient is φ = 111972369720.

The previous prime is 121303400531. The next prime is 121303400593. The reversal of 121303400543 is 345004303121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 345004303121 = 97 ⋅3556745393.

It is a cyclic number.

It is not a de Polignac number, because 121303400543 - 2¹² = 121303396447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121303400503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4665515393 + ... + 4665515418.

It is an arithmetic number, because the mean of its divisors is an integer number (32658607842).

Almost surely, 2^121303400543 is an apocalyptic number.

121303400543 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121303400543 is a deficient number, since it is larger than the sum of its proper divisors (9331030825).

121303400543 is an equidigital number, since it uses as much as digits as its factorization.

121303400543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9331030824.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 121303400543 its reverse (345004303121), we get a palindrome (466307703664).

The spelling of 121303400543 in words is "one hundred twenty-one billion, three hundred three million, four hundred thousand, five hundred forty-three".