221470 has 8 divisors (see below), whose sum is σ = 398664. Its totient is φ = 88584.

The previous prime is 221461. The next prime is 221471. The reversal of 221470 is 74122.

221470 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221471) 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, 11064 + ... + 11083.

It is an arithmetic number, because the mean of its divisors is an integer number (49833).

2²²¹⁴⁷⁰ is an apocalyptic number.

221470 is a deficient number, since it is larger than the sum of its proper divisors (177194).

221470 is a wasteful number, since it uses less digits than its factorization.

221470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22154.

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 221470 is about 470.6059923120. The cubic root of 221470 is about 60.5022652431.

Adding to 221470 its reverse (74122), we get a palindrome (295592).

The spelling of 221470 in words is "two hundred twenty-one thousand, four hundred seventy", and thus it is an iban number.