221248187 has 4 divisors (see below), whose sum is σ = 221364696. Its totient is φ = 221131680.

The previous prime is 221248133. The next prime is 221248211. The reversal of 221248187 is 781842122.

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

It is a cyclic number.

It is not a de Polignac number, because 221248187 - 2¹² = 221244091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221248087) 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, 55358 + ... + 59219.

It is an arithmetic number, because the mean of its divisors is an integer number (55341174).

Almost surely, 2^221248187 is an apocalyptic number.

221248187 is a deficient number, since it is larger than the sum of its proper divisors (116509).

221248187 is a wasteful number, since it uses less digits than its factorization.

221248187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116508.

The product of its digits is 14336, while the sum is 35.

The square root of 221248187 is about 14874.4138371904. The cubic root of 221248187 is about 604.8205984019.

The spelling of 221248187 in words is "two hundred twenty-one million, two hundred forty-eight thousand, one hundred eighty-seven".