1100121 has 32 divisors (see below), whose sum is σ = 1772928.
Its totient is φ = 599040.
The previous prime is 1100101. The next prime is 1100123. The reversal of 1100121 is 1210011.
It is not a de Polignac number, because 1100121 - 25 = 1100089 is a prime.
1100121 is a modest number, since divided by 121 gives 110 as remainder.
It is not an unprimeable number, because it can be changed into a prime (1100123) by changing a digit.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20731 + ... + 20783.
It is an arithmetic number, because the mean of its divisors is an integer number (55404).
21100121 is an apocalyptic number.
1100121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.
1100121 is the 561-st nonagonal number.
It is an amenable number.
1100121 is a deficient number, since it is larger than the sum of its proper divisors (672807).
1100121 is a wasteful number, since it uses less digits than its factorization.
1100121 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 121.
The product of its (nonzero) digits is 2, while the sum is 6.
The square root of 1100121 is about 1048.8665310706.
The cubic root of 1100121 is about 103.2317964340.
Adding to 1100121 its reverse (1210011), we get a palindrome (2310132).
Multiplying 1100121 by its reverse (1210011), we get a palindrome (1331158511331).
It can be divided in two parts, 1100 and 121, that added together give a palindrome (1221).
The spelling of 1100121 in words is "one million, one hundred thousand, one hundred twenty-one".