121303501243 has 4 divisors (see below), whose sum is σ = 121304198520. Its totient is φ = 121302803968.

The previous prime is 121303501171. The next prime is 121303501283. The reversal of 121303501243 is 342105303121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121303501243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121303501283) 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, 150843 + ... + 515131.

It is an arithmetic number, because the mean of its divisors is an integer number (30326049630).

Almost surely, 2^121303501243 is an apocalyptic number.

121303501243 is a deficient number, since it is larger than the sum of its proper divisors (697277).

121303501243 is an equidigital number, since it uses as much as digits as its factorization.

121303501243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697276.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 121303501243 its reverse (342105303121), we get a palindrome (463408804364).

The spelling of 121303501243 in words is "one hundred twenty-one billion, three hundred three million, five hundred one thousand, two hundred forty-three".