1221102 has 16 divisors (see below), whose sum is σ = 2713680. Its totient is φ = 407016.

The previous prime is 1221097. The next prime is 1221113. The reversal of 1221102 is 2011221.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11253 + ... + 11360.

It is an arithmetic number, because the mean of its divisors is an integer number (169605).

2^1221102 is an apocalyptic number.

1221102 is an abundant number, since it is smaller than the sum of its proper divisors (1492578).

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

1221102 is a wasteful number, since it uses less digits than its factorization.

1221102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22624 (or 22618 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1221102 is about 1105.0348410797. The cubic root of 1221102 is about 106.8851360039.

Adding to 1221102 its reverse (2011221), we get a palindrome (3232323).

The spelling of 1221102 in words is "one million, two hundred twenty-one thousand, one hundred two".