438622012021 has 2 divisors, whose sum is σ = 438622012022. Its totient is φ = 438622012020.

The previous prime is 438622012019. The next prime is 438622012039. The reversal of 438622012021 is 120210226834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 241051540900 + 197570471121 = 490970^2 + 444489^2 .

It is a cyclic number.

It is not a de Polignac number, because 438622012021 - 2¹ = 438622012019 is a prime.

Together with 438622012019, 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 (438622012091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219311006010 + 219311006011.

It is an arithmetic number, because the mean of its divisors is an integer number (219311006011).

Almost surely, 2^438622012021 is an apocalyptic number.

It is an amenable number.

438622012021 is a deficient number, since it is larger than the sum of its proper divisors (1).

438622012021 is an equidigital number, since it uses as much as digits as its factorization.

438622012021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 31.

Adding to 438622012021 its reverse (120210226834), we get a palindrome (558832238855).

The spelling of 438622012021 in words is "four hundred thirty-eight billion, six hundred twenty-two million, twelve thousand, twenty-one".