121220110101111 has 16 divisors (see below), whose sum is σ = 184773141740544. Its totient is φ = 69247340534304.

The previous prime is 121220110101073. The next prime is 121220110101149. The reversal of 121220110101111 is 111101011022121.

It is an interprime number because it is at equal distance from previous prime (121220110101073) and next prime (121220110101149).

It is not a de Polignac number, because 121220110101111 - 2²⁹ = 121219573230199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220110101511) 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, 887172111 + ... + 887308736.

It is an arithmetic number, because the mean of its divisors is an integer number (11548321358784).

Almost surely, 2^{121220110101111} is an apocalyptic number.

121220110101111 is a deficient number, since it is larger than the sum of its proper divisors (63553031639433).

121220110101111 is a wasteful number, since it uses less digits than its factorization.

121220110101111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774484110.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 121220110101111 its reverse (111101011022121), we get a palindrome (232321121123232).

The spelling of 121220110101111 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred ten million, one hundred one thousand, one hundred eleven".