221044402 has 16 divisors (see below), whose sum is σ = 333907200. Its totient is φ = 109745280.

The previous prime is 221044391. The next prime is 221044451. The reversal of 221044402 is 204440122.

It is a self number, because there is not a number n which added to its sum of digits gives 221044402.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237474 + ... + 238402.

It is an arithmetic number, because the mean of its divisors is an integer number (20869200).

Almost surely, 2^221044402 is an apocalyptic number.

221044402 is a deficient number, since it is larger than the sum of its proper divisors (112862798).

221044402 is a wasteful number, since it uses less digits than its factorization.

221044402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1641.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 221044402 is about 14867.5620731847. The cubic root of 221044402 is about 604.6348473857.

Adding to 221044402 its reverse (204440122), we get a palindrome (425484524).

The spelling of 221044402 in words is "two hundred twenty-one million, forty-four thousand, four hundred two".