138221633 has 4 divisors (see below), whose sum is σ = 150787248. Its totient is φ = 125656020.

The previous prime is 138221623. The next prime is 138221641. The reversal of 138221633 is 336122831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 336122831 = 11 ⋅30556621.

It is a cyclic number.

It is not a de Polignac number, because 138221633 - 2¹⁶ = 138156097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138221596 and 138221605.

It is not an unprimeable number, because it can be changed into a prime (138221623) 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, 6282791 + ... + 6282812.

It is an arithmetic number, because the mean of its divisors is an integer number (37696812).

Almost surely, 2^138221633 is an apocalyptic number.

It is an amenable number.

138221633 is a deficient number, since it is larger than the sum of its proper divisors (12565615).

138221633 is a wasteful number, since it uses less digits than its factorization.

138221633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12565614.

The product of its digits is 5184, while the sum is 29.

The square root of 138221633 is about 11756.7696668770. The cubic root of 138221633 is about 517.0414249974.

The spelling of 138221633 in words is "one hundred thirty-eight million, two hundred twenty-one thousand, six hundred thirty-three".