147221221 has 8 divisors (see below), whose sum is σ = 168564800. Its totient is φ = 125955648.

The previous prime is 147221213. The next prime is 147221231. The reversal of 147221221 is 122122741.

147221221 is digitally balanced in base 2, because in such base 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 not a de Polignac number, because 147221221 - 2³ = 147221213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 147221192 and 147221201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (147221231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15396 + ... + 23053.

It is an arithmetic number, because the mean of its divisors is an integer number (21070600).

Almost surely, 2^147221221 is an apocalyptic number.

It is an amenable number.

147221221 is a deficient number, since it is larger than the sum of its proper divisors (21343579).

147221221 is an equidigital number, since it uses as much as digits as its factorization.

147221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39003.

The product of its digits is 448, while the sum is 22.

The square root of 147221221 is about 12133.4752235293. The cubic root of 147221221 is about 528.0278205516.

Adding to 147221221 its reverse (122122741), we get a palindrome (269343962).

The spelling of 147221221 in words is "one hundred forty-seven million, two hundred twenty-one thousand, two hundred twenty-one".