138272021 has 8 divisors (see below), whose sum is σ = 144685824. Its totient is φ = 131891760.

The previous prime is 138272011. The next prime is 138272023. The reversal of 138272021 is 120272831.

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 138272021 - 2¹⁰ = 138270997 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138272023) 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, 251 + ... + 16631.

It is an arithmetic number, because the mean of its divisors is an integer number (18085728).

Almost surely, 2^138272021 is an apocalyptic number.

It is an amenable number.

138272021 is a deficient number, since it is larger than the sum of its proper divisors (6413803).

138272021 is a wasteful number, since it uses less digits than its factorization.

138272021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16771.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 138272021 is about 11758.9124071914. The cubic root of 138272021 is about 517.1042456466.

The spelling of 138272021 in words is "one hundred thirty-eight million, two hundred seventy-two thousand, twenty-one".