138146221407 has 4 divisors (see below), whose sum is σ = 184194961880. Its totient is φ = 92097480936.

The previous prime is 138146221399. The next prime is 138146221439. The reversal of 138146221407 is 704122641831.

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

It is not a de Polignac number, because 138146221407 - 2³ = 138146221399 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 (138146221487) 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, 23024370232 + ... + 23024370237.

It is an arithmetic number, because the mean of its divisors is an integer number (46048740470).

Almost surely, 2^138146221407 is an apocalyptic number.

138146221407 is a deficient number, since it is larger than the sum of its proper divisors (46048740473).

138146221407 is an equidigital number, since it uses as much as digits as its factorization.

138146221407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46048740472.

The product of its (nonzero) digits is 64512, while the sum is 39.

The spelling of 138146221407 in words is "one hundred thirty-eight billion, one hundred forty-six million, two hundred twenty-one thousand, four hundred seven".