201000121 has 4 divisors (see below), whose sum is σ = 229714432. Its totient is φ = 172285812.

The previous prime is 201000119. The next prime is 201000133. The reversal of 201000121 is 121000102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201000121 - 2¹ = 201000119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7), and also a Moran number because the ratio is a prime number: 28714303 = 201000121 / (2 + 0 + 1 + 0 + 0 + 0 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201000161) 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, 14357145 + ... + 14357158.

It is an arithmetic number, because the mean of its divisors is an integer number (57428608).

Almost surely, 2^201000121 is an apocalyptic number.

It is an amenable number.

201000121 is a deficient number, since it is larger than the sum of its proper divisors (28714311).

201000121 is an equidigital number, since it uses as much as digits as its factorization.

201000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28714310.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 201000121 is about 14177.4511460982. The cubic root of 201000121 is about 585.7767178089.

Adding to 201000121 its reverse (121000102), we get a palindrome (322000223).

The spelling of 201000121 in words is "two hundred one million, one hundred twenty-one", and thus it is an aban number.