200912121 has 12 divisors (see below), whose sum is σ = 290329572. Its totient is φ = 133884576.

The previous prime is 200912119. The next prime is 200912149. The reversal of 200912121 is 121219002.

It can be written as a sum of positive squares in 2 ways, for example, as 156875625 + 44036496 = 12525^2 + 6636^2 .

It is not a de Polignac number, because 200912121 - 2¹ = 200912119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 200912094 and 200912103.

It is not an unprimeable number, because it can be changed into a prime (200912161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37035 + ... + 42111.

It is an arithmetic number, because the mean of its divisors is an integer number (24194131).

Almost surely, 2^200912121 is an apocalyptic number.

It is an amenable number.

200912121 is a deficient number, since it is larger than the sum of its proper divisors (89417451).

200912121 is a wasteful number, since it uses less digits than its factorization.

200912121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9480 (or 9477 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 200912121 is about 14174.3472865596. The cubic root of 200912121 is about 585.6912188956.

The spelling of 200912121 in words is "two hundred million, nine hundred twelve thousand, one hundred twenty-one".