43505105213 has 4 divisors (see below), whose sum is σ = 43670524128. Its totient is φ = 43339686300.

The previous prime is 43505105197. The next prime is 43505105227. The reversal of 43505105213 is 31250150534.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43505105213 - 2⁴ = 43505105197 is a prime.

It is a super-4 number, since 4×43505105213⁴ (a number of 44 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43505105233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82709063 + ... + 82709588.

It is an arithmetic number, because the mean of its divisors is an integer number (10917631032).

Almost surely, 2^43505105213 is an apocalyptic number.

It is an amenable number.

43505105213 is a deficient number, since it is larger than the sum of its proper divisors (165418915).

43505105213 is a wasteful number, since it uses less digits than its factorization.

43505105213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165418914.

The product of its (nonzero) digits is 9000, while the sum is 29.

Adding to 43505105213 its reverse (31250150534), we get a palindrome (74755255747).

The spelling of 43505105213 in words is "forty-three billion, five hundred five million, one hundred five thousand, two hundred thirteen".