221213221110 has 48 divisors (see below), whose sum is σ = 657319287456. Its totient is φ = 50563021824.

The previous prime is 221213221039. The next prime is 221213221121. The reversal of 221213221110 is 11122312122.

221213221110 is a `hidden beast` number, since 221 + 213 + 221 + 1 + 10 = 666.

221213221110 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 (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 175565419 + ... + 175566678.

It is an arithmetic number, because the mean of its divisors is an integer number (13694151822).

Almost surely, 2^221213221110 is an apocalyptic number.

221213221110 is an abundant number, since it is smaller than the sum of its proper divisors (436106066346).

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

221213221110 is a wasteful number, since it uses less digits than its factorization.

221213221110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351132117 (or 351132114 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 221213221110 its reverse (11122312122), we get a palindrome (232335533232).

The spelling of 221213221110 in words is "two hundred twenty-one billion, two hundred thirteen million, two hundred twenty-one thousand, one hundred ten".