221323146 has 16 divisors (see below), whose sum is σ = 482887008. Its totient is φ = 67067600.

The previous prime is 221323139. The next prime is 221323169. The reversal of 221323146 is 641323122.

221323146 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1676625 + ... + 1676756.

It is an arithmetic number, because the mean of its divisors is an integer number (30180438).

Almost surely, 2^221323146 is an apocalyptic number.

221323146 is an abundant number, since it is smaller than the sum of its proper divisors (261563862).

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

221323146 is a wasteful number, since it uses less digits than its factorization.

221323146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3353397.

The product of its digits is 1728, while the sum is 24.

The square root of 221323146 is about 14876.9333533494. The cubic root of 221323146 is about 604.8888951998. Note that the first 4 decimals are identical.

Subtracting from 221323146 its sum of digits (24), we obtain a palindrome (221323122).

Adding to 221323146 its reverse (641323122), we get a palindrome (862646268).

The spelling of 221323146 in words is "two hundred twenty-one million, three hundred twenty-three thousand, one hundred forty-six".