221913248 has 12 divisors (see below), whose sum is σ = 436891770. Its totient is φ = 110956608.

The previous prime is 221913247. The next prime is 221913271. The reversal of 221913248 is 842319122.

It can be written as a sum of positive squares in only one way, i.e., 185286544 + 36626704 = 13612^2 + 6052^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 6934789 = 221913248 / (2 + 2 + 1 + 9 + 1 + 3 + 2 + 4 + 8).

It is not an unprimeable number, because it can be changed into a prime (221913247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3467363 + ... + 3467426.

Almost surely, 2^221913248 is an apocalyptic number.

It is an amenable number.

221913248 is a deficient number, since it is larger than the sum of its proper divisors (214978522).

221913248 is an equidigital number, since it uses as much as digits as its factorization.

221913248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6934799 (or 6934791 counting only the distinct ones).

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

The square root of 221913248 is about 14896.7529347841. The cubic root of 221913248 is about 605.4260123622.

The spelling of 221913248 in words is "two hundred twenty-one million, nine hundred thirteen thousand, two hundred forty-eight".