121710985111 has 4 divisors (see below), whose sum is σ = 123706247224. Its totient is φ = 119715723000.

The previous prime is 121710985091. The next prime is 121710985139. The reversal of 121710985111 is 111589017121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121710985111 - 2¹¹ = 121710983063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121710988111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 997630965 + ... + 997631086.

It is an arithmetic number, because the mean of its divisors is an integer number (30926561806).

Almost surely, 2^121710985111 is an apocalyptic number.

121710985111 is a deficient number, since it is larger than the sum of its proper divisors (1995262113).

121710985111 is an equidigital number, since it uses as much as digits as its factorization.

121710985111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1995262112.

The product of its (nonzero) digits is 5040, while the sum is 37.

It can be divided in two parts, 1217 and 10985111, that added together give a triangular number (10986328 = T₄₆₈₇).

The spelling of 121710985111 in words is "one hundred twenty-one billion, seven hundred ten million, nine hundred eighty-five thousand, one hundred eleven".