43121301112013 has 2 divisors, whose sum is σ = 43121301112014. Its totient is φ = 43121301112012.

The previous prime is 43121301111989. The next prime is 43121301112061. The reversal of 43121301112013 is 31021110312134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23223117607369 + 19898183504644 = 4819037^2 + 4460738^2 .

It is a cyclic number.

It is not a de Polignac number, because 43121301112013 - 2⁶ = 43121301111949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43121301112013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43121301111013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21560650556006 + 21560650556007.

It is an arithmetic number, because the mean of its divisors is an integer number (21560650556007).

Almost surely, 2^{43121301112013} is an apocalyptic number.

It is an amenable number.

43121301112013 is a deficient number, since it is larger than the sum of its proper divisors (1).

43121301112013 is an equidigital number, since it uses as much as digits as its factorization.

43121301112013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 43121301112013 its reverse (31021110312134), we get a palindrome (74142411424147).

The spelling of 43121301112013 in words is "forty-three trillion, one hundred twenty-one billion, three hundred one million, one hundred twelve thousand, thirteen".