121356005 has 4 divisors (see below), whose sum is σ = 145627212. Its totient is φ = 97084800.

The previous prime is 121355999. The next prime is 121356007. The reversal of 121356005 is 500653121.

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 30096196 + 91259809 = 5486^2 + 9553^2 .

It is not a de Polignac number, because 121356005 - 2⁴ = 121355989 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 (121356007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12135596 + ... + 12135605.

It is an arithmetic number, because the mean of its divisors is an integer number (36406803).

Almost surely, 2^121356005 is an apocalyptic number.

It is an amenable number.

121356005 is a deficient number, since it is larger than the sum of its proper divisors (24271207).

121356005 is an equidigital number, since it uses as much as digits as its factorization.

121356005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24271206.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 121356005 is about 11016.1701602689. The cubic root of 121356005 is about 495.0933470182.

The spelling of 121356005 in words is "one hundred twenty-one million, three hundred fifty-six thousand, five".