121200212111 has 16 divisors (see below), whose sum is σ = 138704140800. Its totient is φ = 104884264800.

The previous prime is 121200212087. The next prime is 121200212117. The reversal of 121200212111 is 111212002121.

It is a cyclic number.

It is not a de Polignac number, because 121200212111 - 2⁶ = 121200212047 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 (121200212117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2652971 + ... + 2698268.

It is an arithmetic number, because the mean of its divisors is an integer number (8669008800).

Almost surely, 2^121200212111 is an apocalyptic number.

121200212111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121200212111 is a deficient number, since it is larger than the sum of its proper divisors (17503928689).

121200212111 is a wasteful number, since it uses less digits than its factorization.

121200212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5351350.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121200212111 its reverse (111212002121), we get a palindrome (232412214232).

It can be divided in two parts, 1212002121 and 11, that multiplied together give a palindrome (13332023331).

The spelling of 121200212111 in words is "one hundred twenty-one billion, two hundred million, two hundred twelve thousand, one hundred eleven".