1321100 has 36 divisors (see below), whose sum is σ = 3130008. Its totient is φ = 480000.

The previous prime is 1321093. The next prime is 1321109. The reversal of 1321100 is 11231.

1321100 is an undulating number in base 7.

It is not an unprimeable number, because it can be changed into a prime (1321109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 500 + ... + 1700.

2^1321100 is an apocalyptic number.

1321100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1565004).

1321100 is an abundant number, since it is smaller than the sum of its proper divisors (1808908).

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

1321100 is a wasteful number, since it uses less digits than its factorization.

1321100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1226 (or 1219 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 1321100 is about 1149.3911431710. The cubic root of 1321100 is about 109.7265937359.

Adding to 1321100 its reverse (11231), we get a palindrome (1332331).

The spelling of 1321100 in words is "one million, three hundred twenty-one thousand, one hundred".