121100111 has 8 divisors (see below), whose sum is σ = 133418448. Its totient is φ = 109000000.

The previous prime is 121100107. The next prime is 121100117. The reversal of 121100111 is 111001121.

It is a happy number.

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 121100111 - 2² = 121100107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121100117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53390 + ... + 55611.

It is an arithmetic number, because the mean of its divisors is an integer number (16677306).

Almost surely, 2^121100111 is an apocalyptic number.

121100111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121100111 is a deficient number, since it is larger than the sum of its proper divisors (12318337).

121100111 is a wasteful number, since it uses less digits than its factorization.

121100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109113.

The product of its (nonzero) digits is 2, while the sum is 8.

The square root of 121100111 is about 11004.5495591596. The cubic root of 121100111 is about 494.7451138192.

Adding to 121100111 its reverse (111001121), we get a palindrome (232101232).

It can be divided in two parts, 1 and 21100111, that added together give a palindrome (21100112).

The spelling of 121100111 in words is "one hundred twenty-one million, one hundred thousand, one hundred eleven".