1221102111 has 8 divisors (see below), whose sum is σ = 1628657280. Its totient is φ = 813807512.

The previous prime is 1221102067. The next prime is 1221102133. The reversal of 1221102111 is 1112011221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221102111 - 2¹¹ = 1221100063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221102151) 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, 53931 + ... + 73148.

It is an arithmetic number, because the mean of its divisors is an integer number (203582160).

Almost surely, 2^1221102111 is an apocalyptic number.

1221102111 is a deficient number, since it is larger than the sum of its proper divisors (407555169).

1221102111 is a wasteful number, since it uses less digits than its factorization.

1221102111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130285.

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1221102111 is about 34944.2715047832. The cubic root of 1221102111 is about 1068.8513924257.

Adding to 1221102111 its reverse (1112011221), we get a palindrome (2333113332).

The spelling of 1221102111 in words is "one billion, two hundred twenty-one million, one hundred two thousand, one hundred eleven".