1438067021 has 2 divisors, whose sum is σ = 1438067022. Its totient is φ = 1438067020.

The previous prime is 1438066997. The next prime is 1438067023. The reversal of 1438067021 is 1207608341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1422345796 + 15721225 = 37714^2 + 3965^2 .

It is a cyclic number.

It is not a de Polignac number, because 1438067021 - 2¹⁰ = 1438065997 is a prime.

Together with 1438067023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1438067023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719033510 + 719033511.

It is an arithmetic number, because the mean of its divisors is an integer number (719033511).

Almost surely, 2^1438067021 is an apocalyptic number.

It is an amenable number.

1438067021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438067021 is an equidigital number, since it uses as much as digits as its factorization.

1438067021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 1438067021 is about 37921.8541345225. The cubic root of 1438067021 is about 1128.7377298238.

The spelling of 1438067021 in words is "one billion, four hundred thirty-eight million, sixty-seven thousand, twenty-one".