121121111202111 has 48 divisors (see below), whose sum is σ = 198522415975104. Its totient is φ = 70728633879552.

The previous prime is 121121111202107. The next prime is 121121111202173. The reversal of 121121111202111 is 111202111121121.

121121111202111 is a `hidden beast` number, since 1 + 211 + 211 + 11 + 20 + 211 + 1 = 666.

It is not a de Polignac number, because 121121111202111 - 2² = 121121111202107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121111202011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 464993916 + ... + 465254321.

It is an arithmetic number, because the mean of its divisors is an integer number (4135883666148).

Almost surely, 2^{121121111202111} is an apocalyptic number.

121121111202111 is a deficient number, since it is larger than the sum of its proper divisors (77401304772993).

121121111202111 is a wasteful number, since it uses less digits than its factorization.

121121111202111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930248320 (or 930248317 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 121121111202111 its reverse (111202111121121), we get a palindrome (232323222323232).

The spelling of 121121111202111 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, one hundred eleven million, two hundred two thousand, one hundred eleven".