338639784421 has 4 divisors (see below), whose sum is σ = 338671703052. Its totient is φ = 338607865792.

The previous prime is 338639784407. The next prime is 338639784451. The reversal of 338639784421 is 124487936833.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 282274377025 + 56365407396 = 531295^2 + 237414^2 .

It is a cyclic number.

It is not a de Polignac number, because 338639784421 - 2¹⁷ = 338639653349 is a prime.

It is a super-2 number, since 2×338639784421² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (338639784451) 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 in 3 ways as a sum of consecutive naturals, for example, 15943396 + ... + 15964621.

It is an arithmetic number, because the mean of its divisors is an integer number (84667925763).

Almost surely, 2^338639784421 is an apocalyptic number.

It is an amenable number.

338639784421 is a deficient number, since it is larger than the sum of its proper divisors (31918631).

338639784421 is a wasteful number, since it uses less digits than its factorization.

338639784421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31918630.

The product of its digits is 20901888, while the sum is 58.

The spelling of 338639784421 in words is "three hundred thirty-eight billion, six hundred thirty-nine million, seven hundred eighty-four thousand, four hundred twenty-one".