121388105 has 4 divisors (see below), whose sum is σ = 145665732. Its totient is φ = 97110480.

The previous prime is 121388077. The next prime is 121388117. The reversal of 121388105 is 501883121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 59969536 + 61418569 = 7744^2 + 7837^2 .

It is not a de Polignac number, because 121388105 - 2¹⁰ = 121387081 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12138806 + ... + 12138815.

It is an arithmetic number, because the mean of its divisors is an integer number (36416433).

Almost surely, 2^121388105 is an apocalyptic number.

It is an amenable number.

121388105 is a deficient number, since it is larger than the sum of its proper divisors (24277627).

121388105 is an equidigital number, since it uses as much as digits as its factorization.

121388105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24277626.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 121388105 is about 11017.6270131095. The cubic root of 121388105 is about 495.1369957177.

The spelling of 121388105 in words is "one hundred twenty-one million, three hundred eighty-eight thousand, one hundred five".