111102121221 has 144 divisors (see below), whose sum is σ = 193731060096. Its totient is φ = 56093700096.

The previous prime is 111102121219. The next prime is 111102121243. The reversal of 111102121221 is 122121201111.

It is a happy number.

It is not a de Polignac number, because 111102121221 - 2¹ = 111102121219 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 111102121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111102121261) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 665282080 + ... + 665282246.

It is an arithmetic number, because the mean of its divisors is an integer number (1345354584).

Almost surely, 2^111102121221 is an apocalyptic number.

It is an amenable number.

111102121221 is a deficient number, since it is larger than the sum of its proper divisors (82628938875).

111102121221 is a wasteful number, since it uses less digits than its factorization.

111102121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428 (or 324 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111102121221 its reverse (122121201111), we get a palindrome (233223322332).

The spelling of 111102121221 in words is "one hundred eleven billion, one hundred two million, one hundred twenty-one thousand, two hundred twenty-one".