121000505 has 4 divisors (see below), whose sum is σ = 145200612. Its totient is φ = 96800400.

The previous prime is 121000501. The next prime is 121000519. The reversal of 121000505 is 505000121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505000121 = 23 ⋅21956527.

It can be written as a sum of positive squares in 2 ways, for example, as 29855296 + 91145209 = 5464^2 + 9547^2 .

It is not a de Polignac number, because 121000505 - 2² = 121000501 is a prime.

It is a super-2 number, since 2×121000505² = 29282244420510050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121000505.

It is not an unprimeable number, because it can be changed into a prime (121000501) 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, 12100046 + ... + 12100055.

It is an arithmetic number, because the mean of its divisors is an integer number (36300153).

Almost surely, 2^121000505 is an apocalyptic number.

It is an amenable number.

121000505 is a deficient number, since it is larger than the sum of its proper divisors (24200107).

121000505 is an equidigital number, since it uses as much as digits as its factorization.

121000505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24200106.

The product of its (nonzero) digits is 50, while the sum is 14.

The square root of 121000505 is about 11000.0229545215. The cubic root of 121000505 is about 494.6094324160.

Adding to 121000505 its reverse (505000121), we get a palindrome (626000626).

The spelling of 121000505 in words is "one hundred twenty-one million, five hundred five", and thus it is an aban number.