221663084 has 12 divisors (see below), whose sum is σ = 391751808. Its totient is φ = 109734000.

The previous prime is 221663053. The next prime is 221663089. The reversal of 221663084 is 480366122.

It is a self number, because there is not a number n which added to its sum of digits gives 221663084.

It is not an unprimeable number, because it can be changed into a prime (221663089) 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, 273932 + ... + 274739.

It is an arithmetic number, because the mean of its divisors is an integer number (32645984).

Almost surely, 2^221663084 is an apocalyptic number.

It is an amenable number.

221663084 is a deficient number, since it is larger than the sum of its proper divisors (170088724).

221663084 is a wasteful number, since it uses less digits than its factorization.

221663084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548776 (or 548774 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 221663084 is about 14888.3539721488. The cubic root of 221663084 is about 605.1984268195.

The spelling of 221663084 in words is "two hundred twenty-one million, six hundred sixty-three thousand, eighty-four".