221248139 has 8 divisors (see below), whose sum is σ = 254140128. Its totient is φ = 188677440.

The previous prime is 221248133. The next prime is 221248211. The reversal of 221248139 is 931842122.

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

It is not a de Polignac number, because 221248139 - 2¹² = 221244043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221248133) 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, 78842 + ... + 81599.

It is an arithmetic number, because the mean of its divisors is an integer number (31767516).

Almost surely, 2^221248139 is an apocalyptic number.

221248139 is a deficient number, since it is larger than the sum of its proper divisors (32891989).

221248139 is a wasteful number, since it uses less digits than its factorization.

221248139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160645.

The product of its digits is 6912, while the sum is 32.

The square root of 221248139 is about 14874.4122236813. The cubic root of 221248139 is about 604.8205546631.

The spelling of 221248139 in words is "two hundred twenty-one million, two hundred forty-eight thousand, one hundred thirty-nine".