43056679021 has 4 divisors (see below), whose sum is σ = 43088316444. Its totient is φ = 43025041600.

The previous prime is 43056678997. The next prime is 43056679051. The reversal of 43056679021 is 12097665034.

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 21378533796 + 21678145225 = 146214^2 + 147235^2 .

It is a cyclic number.

It is not a de Polignac number, because 43056679021 - 2⁷ = 43056678893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43056679051) 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, 15816670 + ... + 15819391.

It is an arithmetic number, because the mean of its divisors is an integer number (10772079111).

Almost surely, 2^43056679021 is an apocalyptic number.

It is an amenable number.

43056679021 is a deficient number, since it is larger than the sum of its proper divisors (31637423).

43056679021 is a wasteful number, since it uses less digits than its factorization.

43056679021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31637422.

The product of its (nonzero) digits is 272160, while the sum is 43.

The spelling of 43056679021 in words is "forty-three billion, fifty-six million, six hundred seventy-nine thousand, twenty-one".