221321346 has 32 divisors (see below), whose sum is σ = 456036480. Its totient is φ = 71554176.

The previous prime is 221321333. The next prime is 221321363. The reversal of 221321346 is 643123122.

221321346 is digitally balanced in base 3, 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 15 ways as a sum of consecutive naturals, for example, 78310 + ... + 81086.

It is an arithmetic number, because the mean of its divisors is an integer number (14251140).

Almost surely, 2^221321346 is an apocalyptic number.

221321346 is an abundant number, since it is smaller than the sum of its proper divisors (234715134).

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

221321346 is a wasteful number, since it uses less digits than its factorization.

221321346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3178.

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

The square root of 221321346 is about 14876.8728568876. The cubic root of 221321346 is about 604.8872553608.

Adding to 221321346 its reverse (643123122), we get a palindrome (864444468).

The spelling of 221321346 in words is "two hundred twenty-one million, three hundred twenty-one thousand, three hundred forty-six".