201202121 has 4 divisors (see below), whose sum is σ = 207692544. Its totient is φ = 194711700.

The previous prime is 201202103. The next prime is 201202181. The reversal of 201202121 is 121202102.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-201202121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (201202181) 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, 3245165 + ... + 3245226.

It is an arithmetic number, because the mean of its divisors is an integer number (51923136).

Almost surely, 2^201202121 is an apocalyptic number.

It is an amenable number.

201202121 is a deficient number, since it is larger than the sum of its proper divisors (6490423).

201202121 is an equidigital number, since it uses as much as digits as its factorization.

201202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6490422.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 201202121 is about 14184.5733457161. The cubic root of 201202121 is about 585.9728823353.

Adding to 201202121 its reverse (121202102), we get a palindrome (322404223).

The spelling of 201202121 in words is "two hundred one million, two hundred two thousand, one hundred twenty-one".