338122721 has 4 divisors (see below), whose sum is σ = 338165700. Its totient is φ = 338079744.

The previous prime is 338122711. The next prime is 338122801. The reversal of 338122721 is 127221833.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 127221833 = 7103 ⋅17911.

It can be written as a sum of positive squares in 2 ways, for example, as 105987025 + 232135696 = 10295^2 + 15236^2 .

It is a cyclic number.

It is not a de Polignac number, because 338122721 - 2⁶ = 338122657 is a prime.

It is a super-2 number, since 2×338122721² = 228653948912887682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (338122711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5936 + ... + 26673.

It is an arithmetic number, because the mean of its divisors is an integer number (84541425).

Almost surely, 2^338122721 is an apocalyptic number.

It is an amenable number.

338122721 is a deficient number, since it is larger than the sum of its proper divisors (42979).

338122721 is a wasteful number, since it uses less digits than its factorization.

338122721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42978.

The product of its digits is 4032, while the sum is 29.

The square root of 338122721 is about 18388.1135791576. The cubic root of 338122721 is about 696.6662715544. Note that the first 3 decimals are identical.

The spelling of 338122721 in words is "three hundred thirty-eight million, one hundred twenty-two thousand, seven hundred twenty-one".