221128146 has 48 divisors (see below), whose sum is σ = 523680768. Its totient is φ = 67132800.

The previous prime is 221128123. The next prime is 221128147. The reversal of 221128146 is 641821122.

221128146 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (221128147) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2170 + ... + 21141.

It is an arithmetic number, because the mean of its divisors is an integer number (10910016).

Almost surely, 2^221128146 is an apocalyptic number.

221128146 is an abundant number, since it is smaller than the sum of its proper divisors (302552622).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221128146 is a wasteful number, since it uses less digits than its factorization.

221128146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23367 (or 23364 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 221128146 is about 14870.3781391059. The cubic root of 221128146 is about 604.7111942601.

Adding to 221128146 its reverse (641821122), we get a palindrome (862949268).

The spelling of 221128146 in words is "two hundred twenty-one million, one hundred twenty-eight thousand, one hundred forty-six".