221321334 has 32 divisors (see below), whose sum is σ = 504735840. Its totient is φ = 64092672.

The previous prime is 221321333. The next prime is 221321363. The reversal of 221321334 is 433123122.

It is a self number, because there is not a number n which added to its sum of digits gives 221321334.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221321333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82129 + ... + 84780.

It is an arithmetic number, because the mean of its divisors is an integer number (15772995).

Almost surely, 2^221321334 is an apocalyptic number.

221321334 is an abundant number, since it is smaller than the sum of its proper divisors (283414506).

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

221321334 is a wasteful number, since it uses less digits than its factorization.

221321334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166944.

The product of its digits is 864, while the sum is 21.

The square root of 221321334 is about 14876.8724535771. The cubic root of 221321334 is about 604.8872444285.

Adding to 221321334 its reverse (433123122), we get a palindrome (654444456).

The spelling of 221321334 in words is "two hundred twenty-one million, three hundred twenty-one thousand, three hundred thirty-four".