201158721 has 20 divisors (see below), whose sum is σ = 310193664. Its totient is φ = 129778200.

The previous prime is 201158707. The next prime is 201158747. The reversal of 201158721 is 127851102.

It is not a de Polignac number, because 201158721 - 2⁷ = 201158593 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (201158701) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 37545 + ... + 42566.

Almost surely, 2^201158721 is an apocalyptic number.

It is an amenable number.

201158721 is a deficient number, since it is larger than the sum of its proper divisors (109034943).

201158721 is an equidigital number, since it uses as much as digits as its factorization.

201158721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80154 (or 80145 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 201158721 is about 14183.0434322116. The cubic root of 201158721 is about 585.9307471734.

The spelling of 201158721 in words is "two hundred one million, one hundred fifty-eight thousand, seven hundred twenty-one".