338036821 has 2 divisors, whose sum is σ = 338036822. Its totient is φ = 338036820.

The previous prime is 338036791. The next prime is 338036869. The reversal of 338036821 is 128630833.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 246929796 + 91107025 = 15714^2 + 9545^2 .

It is a cyclic number.

It is not a de Polignac number, because 338036821 - 2²⁵ = 304482389 is a prime.

It is a super-2 number, since 2×338036821² = 228537784703572082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (338036521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169018410 + 169018411.

It is an arithmetic number, because the mean of its divisors is an integer number (169018411).

Almost surely, 2^338036821 is an apocalyptic number.

It is an amenable number.

338036821 is a deficient number, since it is larger than the sum of its proper divisors (1).

338036821 is an equidigital number, since it uses as much as digits as its factorization.

338036821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 338036821 is about 18385.7776827634. Note that the first 3 decimals coincide. The cubic root of 338036821 is about 696.6072705887.

The spelling of 338036821 in words is "three hundred thirty-eight million, thirty-six thousand, eight hundred twenty-one".