221228470 has 16 divisors (see below), whose sum is σ = 398558880. Its totient is φ = 88414144.

The previous prime is 221228459. The next prime is 221228473. The reversal of 221228470 is 74822122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221228473) 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, 3186 + ... + 21274.

It is an arithmetic number, because the mean of its divisors is an integer number (24909930).

Almost surely, 2^221228470 is an apocalyptic number.

221228470 is a deficient number, since it is larger than the sum of its proper divisors (177330410).

221228470 is a wasteful number, since it uses less digits than its factorization.

221228470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19319.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 221228470 is about 14873.7510400033. The cubic root of 221228470 is about 604.8026312460.

The spelling of 221228470 in words is "two hundred twenty-one million, two hundred twenty-eight thousand, four hundred seventy".