201087721 has 8 divisors (see below), whose sum is σ = 202749920. Its totient is φ = 199431072.

The previous prime is 201087707. The next prime is 201087743. The reversal of 201087721 is 127780102.

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

It is a cyclic number.

It is not a de Polignac number, because 201087721 - 2¹⁷ = 200956649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201087721.

It is not an unprimeable number, because it can be changed into a prime (201087701) 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, 99901 + ... + 101893.

It is an arithmetic number, because the mean of its divisors is an integer number (25343740).

Almost surely, 2^201087721 is an apocalyptic number.

It is an amenable number.

201087721 is a deficient number, since it is larger than the sum of its proper divisors (1662199).

201087721 is a wasteful number, since it uses less digits than its factorization.

201087721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2775.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 201087721 is about 14180.5402224316. The cubic root of 201087721 is about 585.8618033095.

The spelling of 201087721 in words is "two hundred one million, eighty-seven thousand, seven hundred twenty-one".