221074147 has 4 divisors (see below), whose sum is σ = 252656176. Its totient is φ = 189492120.

The previous prime is 221074141. The next prime is 221074151. The reversal of 221074147 is 741470122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221074147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221074141) 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, 15791004 + ... + 15791017.

It is an arithmetic number, because the mean of its divisors is an integer number (63164044).

Almost surely, 2^221074147 is an apocalyptic number.

221074147 is a deficient number, since it is larger than the sum of its proper divisors (31582029).

221074147 is an equidigital number, since it uses as much as digits as its factorization.

221074147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31582028.

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 221074147 is about 14868.5623716619. The cubic root of 221074147 is about 604.6619672113.

The spelling of 221074147 in words is "two hundred twenty-one million, seventy-four thousand, one hundred forty-seven".