43430510021 has 4 divisors (see below), whose sum is σ = 43458477132. Its totient is φ = 43402542912.

The previous prime is 43430509981. The next prime is 43430510033. The reversal of 43430510021 is 12001503434.

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 22089390625 + 21341119396 = 148625^2 + 146086^2 .

It is a cyclic number.

It is not a de Polignac number, because 43430510021 - 2¹⁸ = 43430247877 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 (43430515021) 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, 13981226 + ... + 13984331.

It is an arithmetic number, because the mean of its divisors is an integer number (10864619283).

Almost surely, 2^43430510021 is an apocalyptic number.

It is an amenable number.

43430510021 is a deficient number, since it is larger than the sum of its proper divisors (27967111).

43430510021 is a wasteful number, since it uses less digits than its factorization.

43430510021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27967110.

The product of its (nonzero) digits is 1440, while the sum is 23.

The spelling of 43430510021 in words is "forty-three billion, four hundred thirty million, five hundred ten thousand, twenty-one".