121100111211211 has 16 divisors (see below), whose sum is σ = 132351417040896. Its totient is φ = 109889350480000.

The previous prime is 121100111211169. The next prime is 121100111211293. The reversal of 121100111211211 is 112112111001121.

It is a cyclic number.

It is not a de Polignac number, because 121100111211211 - 2¹⁷ = 121100111080139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121100111212211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9198966 + ... + 18078196.

It is an arithmetic number, because the mean of its divisors is an integer number (8271963565056).

Almost surely, 2^{121100111211211} is an apocalyptic number.

121100111211211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121100111211211 is a deficient number, since it is larger than the sum of its proper divisors (11251305829685).

121100111211211 is a wasteful number, since it uses less digits than its factorization.

121100111211211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8881514.

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 121100111211211 its reverse (112112111001121), we get a palindrome (233212222212332).

The spelling of 121100111211211 in words is "one hundred twenty-one trillion, one hundred billion, one hundred eleven million, two hundred eleven thousand, two hundred eleven".