121100212111211 has 4 divisors (see below), whose sum is σ = 121138020485352. Its totient is φ = 121062403737072.

The previous prime is 121100212111171. The next prime is 121100212111223. The reversal of 121100212111211 is 112111212001121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121100212111211 is a prime.

It is a super-2 number, since 2×121100212111211² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121100212111211.

It is not an unprimeable number, because it can be changed into a prime (121100212111511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18904182266 + ... + 18904188671.

It is an arithmetic number, because the mean of its divisors is an integer number (30284505121338).

Almost surely, 2^{121100212111211} is an apocalyptic number.

121100212111211 is a deficient number, since it is larger than the sum of its proper divisors (37808374141).

121100212111211 is an equidigital number, since it uses as much as digits as its factorization.

121100212111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37808374140.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 121100212111211 its reverse (112111212001121), we get a palindrome (233211424112332).

The spelling of 121100212111211 in words is "one hundred twenty-one trillion, one hundred billion, two hundred twelve million, one hundred eleven thousand, two hundred eleven".