103438021 has 2 divisors, whose sum is σ = 103438022. Its totient is φ = 103438020.

The previous prime is 103438019. The next prime is 103438043. The reversal of 103438021 is 120834301.

It is an a-pointer prime, because the next prime (103438043) can be obtained adding 103438021 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93896100 + 9541921 = 9690^2 + 3089^2 .

It is a cyclic number.

It is not a de Polignac number, because 103438021 - 2¹ = 103438019 is a prime.

Together with 103438019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 103437983 and 103438001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103438001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51719010 + 51719011.

It is an arithmetic number, because the mean of its divisors is an integer number (51719011).

Almost surely, 2^103438021 is an apocalyptic number.

It is an amenable number.

103438021 is a deficient number, since it is larger than the sum of its proper divisors (1).

103438021 is an equidigital number, since it uses as much as digits as its factorization.

103438021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 103438021 is about 10170.4484168595. The cubic root of 103438021 is about 469.4183554839.

The spelling of 103438021 in words is "one hundred three million, four hundred thirty-eight thousand, twenty-one".