228201721 has 8 divisors (see below), whose sum is σ = 250740000. Its totient is φ = 205962240.

The previous prime is 228201697. The next prime is 228201733. The reversal of 228201721 is 127102822.

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

It is not a de Polignac number, because 228201721 - 2⁵ = 228201689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228201221) 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, 73096 + ... + 76153.

It is an arithmetic number, because the mean of its divisors is an integer number (31342500).

Almost surely, 2^228201721 is an apocalyptic number.

It is an amenable number.

228201721 is a deficient number, since it is larger than the sum of its proper divisors (22538279).

228201721 is a wasteful number, since it uses less digits than its factorization.

228201721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149399.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 228201721 is about 15106.3470435443. The cubic root of 228201721 is about 611.0915875110.

The spelling of 228201721 in words is "two hundred twenty-eight million, two hundred one thousand, seven hundred twenty-one".