43432531421 has 2 divisors, whose sum is σ = 43432531422. Its totient is φ = 43432531420.

The previous prime is 43432531399. The next prime is 43432531423. The reversal of 43432531421 is 12413523434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38474822500 + 4957708921 = 196150^2 + 70411^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43432531421 is a prime.

Together with 43432531423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43432531423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21716265710 + 21716265711.

It is an arithmetic number, because the mean of its divisors is an integer number (21716265711).

Almost surely, 2^43432531421 is an apocalyptic number.

It is an amenable number.

43432531421 is a deficient number, since it is larger than the sum of its proper divisors (1).

43432531421 is an equidigital number, since it uses as much as digits as its factorization.

43432531421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 32.

The spelling of 43432531421 in words is "forty-three billion, four hundred thirty-two million, five hundred thirty-one thousand, four hundred twenty-one".