200518121 has 4 divisors (see below), whose sum is σ = 204784512. Its totient is φ = 196251732.

The previous prime is 200518099. The next prime is 200518139. The reversal of 200518121 is 121815002.

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: 121815002 = 2 ⋅60907501.

It is a cyclic number.

It is not a de Polignac number, because 200518121 - 2⁶ = 200518057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200518093 and 200518102.

It is not an unprimeable number, because it can be changed into a prime (200518181) 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, 2133125 + ... + 2133218.

It is an arithmetic number, because the mean of its divisors is an integer number (51196128).

Almost surely, 2^200518121 is an apocalyptic number.

It is an amenable number.

200518121 is a deficient number, since it is larger than the sum of its proper divisors (4266391).

200518121 is an equidigital number, since it uses as much as digits as its factorization.

200518121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4266390.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 200518121 is about 14160.4421188041. The cubic root of 200518121 is about 585.3081105169.

The spelling of 200518121 in words is "two hundred million, five hundred eighteen thousand, one hundred twenty-one".