227128021 has 8 divisors (see below), whose sum is σ = 232675520. Its totient is φ = 221592672.

The previous prime is 227128019. The next prime is 227128037. The reversal of 227128021 is 120821722.

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 227128021 - 2¹ = 227128019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (227128051) 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, 43225 + ... + 48193.

It is an arithmetic number, because the mean of its divisors is an integer number (29084440).

Almost surely, 2^227128021 is an apocalyptic number.

It is an amenable number.

227128021 is a deficient number, since it is larger than the sum of its proper divisors (5547499).

227128021 is a wasteful number, since it uses less digits than its factorization.

227128021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6075.

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

The square root of 227128021 is about 15070.7671005825. The cubic root of 227128021 is about 610.1316754174.

Adding to 227128021 its reverse (120821722), we get a palindrome (347949743).

The spelling of 227128021 in words is "two hundred twenty-seven million, one hundred twenty-eight thousand, twenty-one".