1818200121 has 8 divisors (see below), whose sum is σ = 2424473664. Its totient is φ = 1212030000.

The previous prime is 1818200113. The next prime is 1818200143. The reversal of 1818200121 is 1210028181.

1818200121 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1818200121 - 2³ = 1818200113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1818200091 and 1818200100.

It is not an unprimeable number, because it can be changed into a prime (1818200161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36996 + ... + 70746.

It is an arithmetic number, because the mean of its divisors is an integer number (303059208).

Almost surely, 2^1818200121 is an apocalyptic number.

It is an amenable number.

1818200121 is a deficient number, since it is larger than the sum of its proper divisors (606273543).

1818200121 is a wasteful number, since it uses less digits than its factorization.

1818200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51711.

The product of its (nonzero) digits is 256, while the sum is 24.

The square root of 1818200121 is about 42640.3578901491. The cubic root of 1818200121 is about 1220.5265399399.

The spelling of 1818200121 in words is "one billion, eight hundred eighteen million, two hundred thousand, one hundred twenty-one".