201116721 has 8 divisors (see below), whose sum is σ = 288783040. Its totient is φ = 123764112.

The previous prime is 201116701. The next prime is 201116759. The reversal of 201116721 is 127611102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 201116721 - 2¹⁰ = 201115697 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (201116701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2578381 + ... + 2578458.

It is an arithmetic number, because the mean of its divisors is an integer number (36097880).

Almost surely, 2^201116721 is an apocalyptic number.

It is an amenable number.

201116721 is a deficient number, since it is larger than the sum of its proper divisors (87666319).

201116721 is a wasteful number, since it uses less digits than its factorization.

201116721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5156855.

The product of its (nonzero) digits is 168, while the sum is 21.

The square root of 201116721 is about 14181.5627136081. The cubic root of 201116721 is about 585.8899654395.

Adding to 201116721 its reverse (127611102), we get a palindrome (328727823).

The spelling of 201116721 in words is "two hundred one million, one hundred sixteen thousand, seven hundred twenty-one".