121201010111 has 4 divisors (see below), whose sum is σ = 128330481312. Its totient is φ = 114071538912.

The previous prime is 121201010071. The next prime is 121201010141. The reversal of 121201010111 is 111010102121.

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-121201010111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121201010092 and 121201010101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201010141) 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, 3564735575 + ... + 3564735608.

It is an arithmetic number, because the mean of its divisors is an integer number (32082620328).

Almost surely, 2^121201010111 is an apocalyptic number.

121201010111 is a deficient number, since it is larger than the sum of its proper divisors (7129471201).

121201010111 is an equidigital number, since it uses as much as digits as its factorization.

121201010111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7129471200.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 121201010111 its reverse (111010102121), we get a palindrome (232211112232).

The spelling of 121201010111 in words is "one hundred twenty-one billion, two hundred one million, ten thousand, one hundred eleven".