121101211101111 has 16 divisors (see below), whose sum is σ = 166677248145408. Its totient is φ = 78129667159200.

The previous prime is 121101211101077. The next prime is 121101211101113. The reversal of 121101211101111 is 111101112101121.

It is a happy number.

It is not a de Polignac number, because 121101211101111 - 2⁹ = 121101211100599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121101211101113) 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, 72422110 + ... + 74075396.

It is an arithmetic number, because the mean of its divisors is an integer number (10417328009088).

Almost surely, 2^{121101211101111} is an apocalyptic number.

121101211101111 is a deficient number, since it is larger than the sum of its proper divisors (45576037044297).

121101211101111 is a wasteful number, since it uses less digits than its factorization.

121101211101111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2440942.

The product of its (nonzero) digits is 4, while the sum is 15.

Adding to 121101211101111 its reverse (111101112101121), we get a palindrome (232202323202232).

The spelling of 121101211101111 in words is "one hundred twenty-one trillion, one hundred one billion, two hundred eleven million, one hundred one thousand, one hundred eleven".