43431020510021 has 4 divisors (see below), whose sum is σ = 43458878767200. Its totient is φ = 43403162252844.

The previous prime is 43431020509991. The next prime is 43431020510057. The reversal of 43431020510021 is 12001502013434.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-43431020510021 is a prime.

It is a super-2 number, since 2×43431020510021² (a number of 28 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 (43431020513021) 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, 13929126251 + ... + 13929129368.

It is an arithmetic number, because the mean of its divisors is an integer number (10864719691800).

Almost surely, 2^{43431020510021} is an apocalyptic number.

It is an amenable number.

43431020510021 is a deficient number, since it is larger than the sum of its proper divisors (27858257179).

43431020510021 is a wasteful number, since it uses less digits than its factorization.

43431020510021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27858257178.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 43431020510021 its reverse (12001502013434), we get a palindrome (55432522523455).

The spelling of 43431020510021 in words is "forty-three trillion, four hundred thirty-one billion, twenty million, five hundred ten thousand, twenty-one".