121203220111 has 4 divisors (see below), whose sum is σ = 128332821312. Its totient is φ = 114073618912.

The previous prime is 121203220109. The next prime is 121203220121. The reversal of 121203220111 is 111022302121.

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 121203220111 - 2¹ = 121203220109 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 (121203220121) 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, 3564800575 + ... + 3564800608.

It is an arithmetic number, because the mean of its divisors is an integer number (32083205328).

Almost surely, 2^121203220111 is an apocalyptic number.

121203220111 is a deficient number, since it is larger than the sum of its proper divisors (7129601201).

121203220111 is an equidigital number, since it uses as much as digits as its factorization.

121203220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7129601200.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 121203220111 its reverse (111022302121), we get a palindrome (232225522232).

The spelling of 121203220111 in words is "one hundred twenty-one billion, two hundred three million, two hundred twenty thousand, one hundred eleven".