121640430313 has 4 divisors (see below), whose sum is σ = 125834927940. Its totient is φ = 117445932688.

The previous prime is 121640430277. The next prime is 121640430377. The reversal of 121640430313 is 313034046121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48018833424 + 73621596889 = 219132^2 + 271333^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121640430313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121640430113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2097248770 + ... + 2097248827.

It is an arithmetic number, because the mean of its divisors is an integer number (31458731985).

Almost surely, 2^121640430313 is an apocalyptic number.

It is an amenable number.

121640430313 is a deficient number, since it is larger than the sum of its proper divisors (4194497627).

121640430313 is an equidigital number, since it uses as much as digits as its factorization.

121640430313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4194497626.

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 121640430313 its reverse (313034046121), we get a palindrome (434674476434).

The spelling of 121640430313 in words is "one hundred twenty-one billion, six hundred forty million, four hundred thirty thousand, three hundred thirteen".