43220431021 has 2 divisors, whose sum is σ = 43220431022. Its totient is φ = 43220431020.

The previous prime is 43220431019. The next prime is 43220431081. The reversal of 43220431021 is 12013402234.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42595180996 + 625250025 = 206386^2 + 25005^2 .

It is a cyclic number.

It is not a de Polignac number, because 43220431021 - 2¹ = 43220431019 is a prime.

Together with 43220431019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 43220430983 and 43220431001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43220431081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21610215510 + 21610215511.

It is an arithmetic number, because the mean of its divisors is an integer number (21610215511).

Almost surely, 2^43220431021 is an apocalyptic number.

It is an amenable number.

43220431021 is a deficient number, since it is larger than the sum of its proper divisors (1).

43220431021 is an equidigital number, since it uses as much as digits as its factorization.

43220431021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 43220431021 its reverse (12013402234), we get a palindrome (55233833255).

The spelling of 43220431021 in words is "forty-three billion, two hundred twenty million, four hundred thirty-one thousand, twenty-one".