121220212111 has 4 divisors (see below), whose sum is σ = 121220923824. Its totient is φ = 121219500400.

The previous prime is 121220212109. The next prime is 121220212117. The reversal of 121220212111 is 111212022121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 121220212111 - 2¹ = 121220212109 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 (121220212117) 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 3 ways as a sum of consecutive naturals, for example, 67566 + ... + 496996.

It is an arithmetic number, because the mean of its divisors is an integer number (30305230956).

Almost surely, 2^121220212111 is an apocalyptic number.

121220212111 is a deficient number, since it is larger than the sum of its proper divisors (711713).

121220212111 is an equidigital number, since it uses as much as digits as its factorization.

121220212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711712.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121220212111 its reverse (111212022121), we get a palindrome (232432234232).

The spelling of 121220212111 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred twelve thousand, one hundred eleven".