121100021200111 has 4 divisors (see below), whose sum is σ = 121315118929272. Its totient is φ = 120884923470952.

The previous prime is 121100021200097. The next prime is 121100021200153. The reversal of 121100021200111 is 111002120001121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121100021200111 - 2¹¹ = 121100021198063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121100021200091 and 121100021200100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121100021201111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107548863736 + ... + 107548864861.

It is an arithmetic number, because the mean of its divisors is an integer number (30328779732318).

Almost surely, 2^{121100021200111} is an apocalyptic number.

121100021200111 is a deficient number, since it is larger than the sum of its proper divisors (215097729161).

121100021200111 is an equidigital number, since it uses as much as digits as its factorization.

121100021200111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215097729160.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121100021200111 its reverse (111002120001121), we get a palindrome (232102141201232).

The spelling of 121100021200111 in words is "one hundred twenty-one trillion, one hundred billion, twenty-one million, two hundred thousand, one hundred eleven".