5431443421 has 2 divisors, whose sum is σ = 5431443422. Its totient is φ = 5431443420.

The previous prime is 5431443419. The next prime is 5431443431. The reversal of 5431443421 is 1243441345.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4756171225 + 675272196 = 68965^2 + 25986^2 .

It is a cyclic number.

It is not a de Polignac number, because 5431443421 - 2¹ = 5431443419 is a prime.

Together with 5431443419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5431443431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2715721710 + 2715721711.

It is an arithmetic number, because the mean of its divisors is an integer number (2715721711).

Almost surely, 2^5431443421 is an apocalyptic number.

It is an amenable number.

5431443421 is a deficient number, since it is larger than the sum of its proper divisors (1).

5431443421 is an equidigital number, since it uses as much as digits as its factorization.

5431443421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 31.

The square root of 5431443421 is about 73698.3271248405. The cubic root of 5431443421 is about 1757.8092815392.

Adding to 5431443421 its reverse (1243441345), we get a palindrome (6674884766).

The spelling of 5431443421 in words is "five billion, four hundred thirty-one million, four hundred forty-three thousand, four hundred twenty-one".