103128221 has 8 divisors (see below), whose sum is σ = 118110720. Its totient is φ = 88208208.

The previous prime is 103128217. The next prime is 103128229. The reversal of 103128221 is 122821301.

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 103128221 - 2² = 103128217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 103128193 and 103128202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103128229) 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, 12026 + ... + 18731.

It is an arithmetic number, because the mean of its divisors is an integer number (14763840).

Almost surely, 2^103128221 is an apocalyptic number.

It is an amenable number.

103128221 is a deficient number, since it is larger than the sum of its proper divisors (14982499).

103128221 is an equidigital number, since it uses as much as digits as its factorization.

103128221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31243.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 103128221 is about 10155.2065956336. The cubic root of 103128221 is about 468.9492461175.

Adding to 103128221 its reverse (122821301), we get a palindrome (225949522).

The spelling of 103128221 in words is "one hundred three million, one hundred twenty-eight thousand, two hundred twenty-one".