138233221 has 8 divisors (see below), whose sum is σ = 162250880. Its totient is φ = 115283088.

The previous prime is 138233209. The next prime is 138233233. The reversal of 138233221 is 122332831.

It is an interprime number because it is at equal distance from previous prime (138233209) and next prime (138233233).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138233221 - 2⁷ = 138233093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138233321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266601 + ... + 267118.

It is an arithmetic number, because the mean of its divisors is an integer number (20281360).

Almost surely, 2^138233221 is an apocalyptic number.

It is an amenable number.

138233221 is a deficient number, since it is larger than the sum of its proper divisors (24017659).

138233221 is an equidigital number, since it uses as much as digits as its factorization.

138233221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533763.

The product of its digits is 1728, while the sum is 25.

The square root of 138233221 is about 11757.2624789957. The cubic root of 138233221 is about 517.0558735524.

The spelling of 138233221 in words is "one hundred thirty-eight million, two hundred thirty-three thousand, two hundred twenty-one".