138335321 has 2 divisors, whose sum is σ = 138335322. Its totient is φ = 138335320.

The previous prime is 138335311. The next prime is 138335347. The reversal of 138335321 is 123533831.

138335321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109830400 + 28504921 = 10480^2 + 5339^2 .

It is a cyclic number.

It is not a de Polignac number, because 138335321 - 2²² = 134141017 is a prime.

It is a super-2 number, since 2×138335321² = 38273322072346082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138335311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69167660 + 69167661.

It is an arithmetic number, because the mean of its divisors is an integer number (69167661).

Almost surely, 2^138335321 is an apocalyptic number.

It is an amenable number.

138335321 is a deficient number, since it is larger than the sum of its proper divisors (1).

138335321 is an equidigital number, since it uses as much as digits as its factorization.

138335321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 29.

The square root of 138335321 is about 11761.6036746695. The cubic root of 138335321 is about 517.1831425554.

The spelling of 138335321 in words is "one hundred thirty-eight million, three hundred thirty-five thousand, three hundred twenty-one".