221210328 has 16 divisors (see below), whose sum is σ = 553025880. Its totient is φ = 73736768.

The previous prime is 221210323. The next prime is 221210333. The reversal of 221210328 is 823012122.

It is a happy number.

221210328 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221210323) and next prime (221210333).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221210321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4608525 + ... + 4608572.

Almost surely, 2^221210328 is an apocalyptic number.

It is an amenable number.

221210328 is an abundant number, since it is smaller than the sum of its proper divisors (331815552).

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

221210328 is a wasteful number, since it uses less digits than its factorization.

221210328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9217106 (or 9217102 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 221210328 is about 14873.1411611670. The cubic root of 221210328 is about 604.7860983689.

The spelling of 221210328 in words is "two hundred twenty-one million, two hundred ten thousand, three hundred twenty-eight".