1438316066821 has 2 divisors, whose sum is σ = 1438316066822. Its totient is φ = 1438316066820.

The previous prime is 1438316066801. The next prime is 1438316066843. The reversal of 1438316066821 is 1286606138341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 837829008900 + 600487057921 = 915330^2 + 774911^2 .

It is an emirp because it is prime and its reverse (1286606138341) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1438316066821 - 2²⁵ = 1438282512389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1438316066801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719158033410 + 719158033411.

It is an arithmetic number, because the mean of its divisors is an integer number (719158033411).

Almost surely, 2^{1438316066821} is an apocalyptic number.

It is an amenable number.

1438316066821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438316066821 is an equidigital number, since it uses as much as digits as its factorization.

1438316066821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 49.

The spelling of 1438316066821 in words is "one trillion, four hundred thirty-eight billion, three hundred sixteen million, sixty-six thousand, eight hundred twenty-one".