201221897 has 4 divisors (see below), whose sum is σ = 205901520. Its totient is φ = 196542276.

The previous prime is 201221893. The next prime is 201221921. The reversal of 201221897 is 798122102.

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 not a de Polignac number, because 201221897 - 2² = 201221893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201221893) 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, 2339747 + ... + 2339832.

It is an arithmetic number, because the mean of its divisors is an integer number (51475380).

Almost surely, 2^201221897 is an apocalyptic number.

It is an amenable number.

201221897 is a deficient number, since it is larger than the sum of its proper divisors (4679623).

201221897 is an equidigital number, since it uses as much as digits as its factorization.

201221897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4679622.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 201221897 is about 14185.2704239292. The cubic root of 201221897 is about 585.9920799793.

Adding to 201221897 its reverse (798122102), we get a palindrome (999343999).

The spelling of 201221897 in words is "two hundred one million, two hundred twenty-one thousand, eight hundred ninety-seven".