121201011111 has 16 divisors (see below), whose sum is σ = 167612224608. Its totient is φ = 77838480000.

The previous prime is 121201011103. The next prime is 121201011137. The reversal of 121201011111 is 111110102121.

It is not a de Polignac number, because 121201011111 - 2³ = 121201011103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201018111) 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, 5394240 + ... + 5416661.

It is an arithmetic number, because the mean of its divisors is an integer number (10475764038).

Almost surely, 2^121201011111 is an apocalyptic number.

121201011111 is a deficient number, since it is larger than the sum of its proper divisors (46411213497).

121201011111 is a wasteful number, since it uses less digits than its factorization.

121201011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10811042.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 121201011111 its reverse (111110102121), we get a palindrome (232311113232).

The spelling of 121201011111 in words is "one hundred twenty-one billion, two hundred one million, eleven thousand, one hundred eleven".