221221324 has 12 divisors (see below), whose sum is σ = 387256464. Its totient is φ = 110576624.

The previous prime is 221221249. The next prime is 221221327. The reversal of 221221324 is 423122122.

It is not an unprimeable number, because it can be changed into a prime (221221327) 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, 11169 + ... + 23815.

It is an arithmetic number, because the mean of its divisors is an integer number (32271372).

Almost surely, 2^221221324 is an apocalyptic number.

It is an amenable number.

221221324 is a deficient number, since it is larger than the sum of its proper divisors (166035140).

221221324 is a wasteful number, since it uses less digits than its factorization.

221221324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17024 (or 17022 counting only the distinct ones).

The product of its digits is 384, while the sum is 19.

The square root of 221221324 is about 14873.5108162128. The cubic root of 221221324 is about 604.7961191755.

Adding to 221221324 its reverse (423122122), we get a palindrome (644343446).

The spelling of 221221324 in words is "two hundred twenty-one million, two hundred twenty-one thousand, three hundred twenty-four".