121716111 has 8 divisors (see below), whose sum is σ = 177041664. Its totient is φ = 73767320.

The previous prime is 121716083. The next prime is 121716121. The reversal of 121716111 is 111617121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121716111 - 2⁶ = 121716047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121716121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1844151 + ... + 1844216.

It is an arithmetic number, because the mean of its divisors is an integer number (22130208).

Almost surely, 2^121716111 is an apocalyptic number.

121716111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121716111 is a deficient number, since it is larger than the sum of its proper divisors (55325553).

121716111 is a wasteful number, since it uses less digits than its factorization.

121716111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3688381.

The product of its digits is 84, while the sum is 21.

The square root of 121716111 is about 11032.5024813050. The cubic root of 121716111 is about 495.5825688717.

The spelling of 121716111 in words is "one hundred twenty-one million, seven hundred sixteen thousand, one hundred eleven".