221121110 has 16 divisors (see below), whose sum is σ = 454877856. Its totient is φ = 75812928.

The previous prime is 221121071. The next prime is 221121113. The reversal of 221121110 is 11121122.

It is a junction number, because it is equal to n+sod(n) for n = 221121091 and 221121100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1579367 + ... + 1579506.

It is an arithmetic number, because the mean of its divisors is an integer number (28429866).

Almost surely, 2^221121110 is an apocalyptic number.

221121110 is an abundant number, since it is smaller than the sum of its proper divisors (233756746).

221121110 is a wasteful number, since it uses less digits than its factorization.

221121110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3158887.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 221121110 is about 14870.1415595145. The cubic root of 221121110 is about 604.7047804933.

Adding to 221121110 its reverse (11121122), we get a palindrome (232242232).

The spelling of 221121110 in words is "two hundred twenty-one million, one hundred twenty-one thousand, one hundred ten".