200019121 has 4 divisors (see below), whose sum is σ = 200047732. Its totient is φ = 199990512.

The previous prime is 200019107. The next prime is 200019133. The reversal of 200019121 is 121910002.

200019121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 121910002 = 2 ⋅60955001.

It can be written as a sum of positive squares in 2 ways, for example, as 93702400 + 106316721 = 9680^2 + 10311^2 .

It is a cyclic number.

It is not a de Polignac number, because 200019121 - 2⁵ = 200019089 is a prime.

It is a super-2 number, since 2×200019121² = 80015297531225282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200019095 and 200019104.

It is not an unprimeable number, because it can be changed into a prime (200019221) 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, 3931 + ... + 20383.

It is an arithmetic number, because the mean of its divisors is an integer number (50011933).

Almost surely, 2^200019121 is an apocalyptic number.

It is an amenable number.

200019121 is a deficient number, since it is larger than the sum of its proper divisors (28611).

200019121 is a wasteful number, since it uses less digits than its factorization.

200019121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28610.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 200019121 is about 14142.8116370119. The cubic root of 200019121 is about 584.8221837631.

Adding to 200019121 its reverse (121910002), we get a palindrome (321929123).

The spelling of 200019121 in words is "two hundred million, nineteen thousand, one hundred twenty-one".