121659916 has 12 divisors (see below), whose sum is σ = 243319888. Its totient is φ = 52139952.

The previous prime is 121659899. The next prime is 121659917. The reversal of 121659916 is 619956121.

121659916 is an admirable number.

It is a super-2 number, since 2×121659916² = 29602270322254112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121659917) 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, 2172471 + ... + 2172526.

Almost surely, 2^121659916 is an apocalyptic number.

It is an amenable number.

121659916 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121659916 is a wasteful number, since it uses less digits than its factorization.

121659916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4345008 (or 4345006 counting only the distinct ones).

The product of its digits is 29160, while the sum is 40.

The square root of 121659916 is about 11029.9553942888. The cubic root of 121659916 is about 495.5062887769.

The spelling of 121659916 in words is "one hundred twenty-one million, six hundred fifty-nine thousand, nine hundred sixteen".