121691216 has 20 divisors (see below), whose sum is σ = 236300352. Its totient is φ = 60710496.

The previous prime is 121691201. The next prime is 121691237. The reversal of 121691216 is 612196121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 806 + ... + 15621.

Almost surely, 2^121691216 is an apocalyptic number.

121691216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121691216 is a deficient number, since it is larger than the sum of its proper divisors (114609136).

121691216 is a wasteful number, since it uses less digits than its factorization.

121691216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16898 (or 16892 counting only the distinct ones).

The product of its digits is 1296, while the sum is 29.

The square root of 121691216 is about 11031.3741664400. The cubic root of 121691216 is about 495.5487788522.

The spelling of 121691216 in words is "one hundred twenty-one million, six hundred ninety-one thousand, two hundred sixteen".