1221099 has 8 divisors (see below), whose sum is σ = 1776192. Its totient is φ = 740040.

The previous prime is 1221097. The next prime is 1221113. The reversal of 1221099 is 9901221.

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

It is not a de Polignac number, because 1221099 - 2¹ = 1221097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221097) by changing a digit.

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, 18469 + ... + 18534.

It is an arithmetic number, because the mean of its divisors is an integer number (222024).

2^1221099 is an apocalyptic number.

1221099 is a deficient number, since it is larger than the sum of its proper divisors (555093).

1221099 is a wasteful number, since it uses less digits than its factorization.

1221099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37017.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 1221099 is about 1105.0334836556. The cubic root of 1221099 is about 106.8850484721.

It can be divided in two parts, 122 and 1099, that added together give a palindrome (1221).

The spelling of 1221099 in words is "one million, two hundred twenty-one thousand, ninety-nine".