200406121 has 4 divisors (see below), whose sum is σ = 200434500. Its totient is φ = 200377744.

The previous prime is 200406113. The next prime is 200406131. The reversal of 200406121 is 121604002.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 182250000 + 18156121 = 13500^2 + 4261^2 .

It is a cyclic number.

It is not a de Polignac number, because 200406121 - 2³ = 200406113 is a prime.

It is a super-2 number, since 2×200406121² = 80325226668533282, 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 = 200406095 and 200406104.

It is not an unprimeable number, because it can be changed into a prime (200406131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5655 + ... + 20803.

It is an arithmetic number, because the mean of its divisors is an integer number (50108625).

Almost surely, 2^200406121 is an apocalyptic number.

It is an amenable number.

200406121 is a deficient number, since it is larger than the sum of its proper divisors (28379).

200406121 is a wasteful number, since it uses less digits than its factorization.

200406121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28378.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 200406121 is about 14156.4868876427. The cubic root of 200406121 is about 585.1991150189.

The spelling of 200406121 in words is "two hundred million, four hundred six thousand, one hundred twenty-one".