221443146 has 20 divisors (see below), whose sum is σ = 496197042. Its totient is φ = 73814328.

The previous prime is 221443133. The next prime is 221443153. The reversal of 221443146 is 641344122.

It is a happy number.

221443146 is a `hidden beast` number, since 221 + 4 + 431 + 4 + 6 = 666.

221443146 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 175271121 + 46172025 = 13239^2 + 6795^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 683305 + ... + 683628.

Almost surely, 2^221443146 is an apocalyptic number.

221443146 is an abundant number, since it is smaller than the sum of its proper divisors (274753896).

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

221443146 is a wasteful number, since it uses less digits than its factorization.

221443146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366947 (or 1366938 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 221443146 is about 14880.9658960701. The cubic root of 221443146 is about 604.9981977498.

Adding to 221443146 its reverse (641344122), we get a palindrome (862787268).

The spelling of 221443146 in words is "two hundred twenty-one million, four hundred forty-three thousand, one hundred forty-six".