138700121 has 4 divisors (see below), whose sum is σ = 158514432. Its totient is φ = 118885812.

The previous prime is 138700103. The next prime is 138700157. The reversal of 138700121 is 121007831.

It is a happy number.

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: 121007831 = 7 ⋅17286833.

It is a cyclic number.

It is not a de Polignac number, because 138700121 - 2¹⁰ = 138699097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138700321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9907145 + ... + 9907158.

It is an arithmetic number, because the mean of its divisors is an integer number (39628608).

Almost surely, 2^138700121 is an apocalyptic number.

It is an amenable number.

138700121 is a deficient number, since it is larger than the sum of its proper divisors (19814311).

138700121 is an equidigital number, since it uses as much as digits as its factorization.

138700121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19814310.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 138700121 is about 11777.1015534384. The cubic root of 138700121 is about 517.6373596650.

Adding to 138700121 its reverse (121007831), we get a palindrome (259707952).

The spelling of 138700121 in words is "one hundred thirty-eight million, seven hundred thousand, one hundred twenty-one".