43200216421 has 2 divisors, whose sum is σ = 43200216422. Its totient is φ = 43200216420.

The previous prime is 43200216407. The next prime is 43200216461. The reversal of 43200216421 is 12461200234.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42687692100 + 512524321 = 206610^2 + 22639^2 .

It is a cyclic number.

It is not a de Polignac number, because 43200216421 - 2⁹ = 43200215909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43200216461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21600108210 + 21600108211.

It is an arithmetic number, because the mean of its divisors is an integer number (21600108211).

Almost surely, 2^43200216421 is an apocalyptic number.

It is an amenable number.

43200216421 is a deficient number, since it is larger than the sum of its proper divisors (1).

43200216421 is an equidigital number, since it uses as much as digits as its factorization.

43200216421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 43200216421 its reverse (12461200234), we get a palindrome (55661416655).

The spelling of 43200216421 in words is "forty-three billion, two hundred million, two hundred sixteen thousand, four hundred twenty-one".