221002104 has 32 divisors (see below), whose sum is σ = 553633920. Its totient is φ = 73516896.

The previous prime is 221002097. The next prime is 221002121. The reversal of 221002104 is 401200122.

221002104 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 221002104.

It is a congruent number.

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, 2919 + ... + 21225.

It is an arithmetic number, because the mean of its divisors is an integer number (17301060).

Almost surely, 2^221002104 is an apocalyptic number.

221002104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

221002104 is an abundant number, since it is smaller than the sum of its proper divisors (332631816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221002104 is a wasteful number, since it uses less digits than its factorization.

221002104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18819 (or 18815 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 221002104 is about 14866.1395123280. The cubic root of 221002104 is about 604.5962782475.

Adding to 221002104 its reverse (401200122), we get a palindrome (622202226).

The spelling of 221002104 in words is "two hundred twenty-one million, two thousand, one hundred four".