43528431421 has 2 divisors, whose sum is σ = 43528431422. Its totient is φ = 43528431420.

The previous prime is 43528431409. The next prime is 43528431491. The reversal of 43528431421 is 12413482534.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25007943321 + 18520488100 = 158139^2 + 136090^2 .

It is a cyclic number.

It is not a de Polignac number, because 43528431421 - 2⁵ = 43528431389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43528431491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21764215710 + 21764215711.

It is an arithmetic number, because the mean of its divisors is an integer number (21764215711).

Almost surely, 2^43528431421 is an apocalyptic number.

It is an amenable number.

43528431421 is a deficient number, since it is larger than the sum of its proper divisors (1).

43528431421 is an equidigital number, since it uses as much as digits as its factorization.

43528431421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92160, while the sum is 37.

The spelling of 43528431421 in words is "forty-three billion, five hundred twenty-eight million, four hundred thirty-one thousand, four hundred twenty-one".