43021312013 has 8 divisors (see below), whose sum is σ = 44073621816. Its totient is φ = 41969145600.

The previous prime is 43021312007. The next prime is 43021312073. The reversal of 43021312013 is 31021312034.

It can be written as a sum of positive squares in 4 ways, for example, as 6073552489 + 36947759524 = 77933^2 + 192218^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 43021312013 - 2⁴ = 43021311997 is a prime.

It is a super-2 number, since 2×43021312013² (a number of 22 digits) contains 22 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 (43021312003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 815795 + ... + 866927.

It is an arithmetic number, because the mean of its divisors is an integer number (5509202727).

Almost surely, 2^43021312013 is an apocalyptic number.

It is an amenable number.

43021312013 is a deficient number, since it is larger than the sum of its proper divisors (1052309803).

43021312013 is a wasteful number, since it uses less digits than its factorization.

43021312013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71695.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 43021312013 its reverse (31021312034), we get a palindrome (74042624047).

The spelling of 43021312013 in words is "forty-three billion, twenty-one million, three hundred twelve thousand, thirteen".