221002110 has 192 divisors, whose sum is σ = 711360000. Its totient is φ = 46469376.

The previous prime is 221002097. The next prime is 221002121. The reversal of 221002110 is 11200122.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221002092 and 221002101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 442641 + ... + 443139.

It is an arithmetic number, because the mean of its divisors is an integer number (3705000).

Almost surely, 2^221002110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221002110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (355680000).

221002110 is an abundant number, since it is smaller than the sum of its proper divisors (490357890).

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

221002110 is a wasteful number, since it uses less digits than its factorization.

221002110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575 (or 572 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 221002110 is about 14866.1397141289. The cubic root of 221002110 is about 604.5962837190.

Adding to 221002110 its reverse (11200122), we get a palindrome (232202232).

The spelling of 221002110 in words is "two hundred twenty-one million, two thousand, one hundred ten".