201121243 has 4 divisors (see below), whose sum is σ = 202471200. Its totient is φ = 199771288.

The previous prime is 201121229. The next prime is 201121253. The reversal of 201121243 is 342121102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201121243 - 2¹⁷ = 200990171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201121253) 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, 674755 + ... + 675052.

It is an arithmetic number, because the mean of its divisors is an integer number (50617800).

Almost surely, 2^201121243 is an apocalyptic number.

201121243 is a deficient number, since it is larger than the sum of its proper divisors (1349957).

201121243 is a wasteful number, since it uses less digits than its factorization.

201121243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349956.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 201121243 is about 14181.7221450711. The cubic root of 201121243 is about 585.8943565456.

Adding to 201121243 its reverse (342121102), we get a palindrome (543242345).

The spelling of 201121243 in words is "two hundred one million, one hundred twenty-one thousand, two hundred forty-three".