221212101110 has 128 divisors (see below), whose sum is σ = 536041497600. Its totient is φ = 63476421120.

The previous prime is 221212101101. The next prime is 221212101113. The reversal of 221212101110 is 11101212122.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212101113) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3764636 + ... + 3822944.

It is an arithmetic number, because the mean of its divisors is an integer number (4187824200).

Almost surely, 2^221212101110 is an apocalyptic number.

221212101110 is an abundant number, since it is smaller than the sum of its proper divisors (314829396490).

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

221212101110 is a wasteful number, since it uses less digits than its factorization.

221212101110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58726.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 221212101110 its reverse (11101212122), we get a palindrome (232313313232).

The spelling of 221212101110 in words is "two hundred twenty-one billion, two hundred twelve million, one hundred one thousand, one hundred ten".