200120121 has 6 divisors (see below), whose sum is σ = 289062410. Its totient is φ = 133413408.

The previous prime is 200120069. The next prime is 200120131. The reversal of 200120121 is 121021002.

It can be written as a sum of positive squares in only one way, i.e., 195860025 + 4260096 = 13995^2 + 2064^2 .

It is not a de Polignac number, because 200120121 - 2¹⁰ = 200119097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 22235569 = 200120121 / (2 + 0 + 0 + 1 + 2 + 0 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (200120131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11117776 + ... + 11117793.

Almost surely, 2^200120121 is an apocalyptic number.

It is an amenable number.

200120121 is a deficient number, since it is larger than the sum of its proper divisors (88942289).

200120121 is a wasteful number, since it uses less digits than its factorization.

200120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22235575 (or 22235572 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 200120121 is about 14146.3819049254. The cubic root of 200120121 is about 584.9206028560.

Adding to 200120121 its reverse (121021002), we get a palindrome (321141123).

It can be divided in two parts, 2001 and 20121, that added together give a palindrome (22122).

The spelling of 200120121 in words is "two hundred million, one hundred twenty thousand, one hundred twenty-one".