121236005 has 16 divisors (see below), whose sum is σ = 160121664. Its totient is φ = 87386880.

The previous prime is 121235987. The next prime is 121236019. The reversal of 121236005 is 500632121.

It is not a de Polignac number, because 121236005 - 2⁸ = 121235749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3539 + ... + 15968.

It is an arithmetic number, because the mean of its divisors is an integer number (10007604).

Almost surely, 2^121236005 is an apocalyptic number.

It is an amenable number.

121236005 is a deficient number, since it is larger than the sum of its proper divisors (38885659).

121236005 is a wasteful number, since it uses less digits than its factorization.

121236005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19636.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 121236005 is about 11010.7222742198. The cubic root of 121236005 is about 494.9301061060.

Adding to 121236005 its reverse (500632121), we get a palindrome (621868126).

The spelling of 121236005 in words is "one hundred twenty-one million, two hundred thirty-six thousand, five".