221248247 has 16 divisors (see below), whose sum is σ = 252564480. Its totient is φ = 191848800.

The previous prime is 221248219. The next prime is 221248249. The reversal of 221248247 is 742842122.

It is not a de Polignac number, because 221248247 - 2⁸ = 221247991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221248249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108029 + ... + 110057.

It is an arithmetic number, because the mean of its divisors is an integer number (15785280).

Almost surely, 2^221248247 is an apocalyptic number.

221248247 is a deficient number, since it is larger than the sum of its proper divisors (31316233).

221248247 is a wasteful number, since it uses less digits than its factorization.

221248247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2494.

The product of its digits is 14336, while the sum is 32.

The square root of 221248247 is about 14874.4158540764. The cubic root of 221248247 is about 604.8206530753.

The spelling of 221248247 in words is "two hundred twenty-one million, two hundred forty-eight thousand, two hundred forty-seven".