121516424 has 8 divisors (see below), whose sum is σ = 227843310. Its totient is φ = 60758208.

The previous prime is 121516393. The next prime is 121516427. The reversal of 121516424 is 424615121.

It can be written as a sum of positive squares in only one way, i.e., 79032100 + 42484324 = 8890^2 + 6518^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 121516393 and 121516402.

It is not an unprimeable number, because it can be changed into a prime (121516427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7594769 + ... + 7594784.

Almost surely, 2^121516424 is an apocalyptic number.

It is an amenable number.

121516424 is a deficient number, since it is larger than the sum of its proper divisors (106326886).

121516424 is a wasteful number, since it uses less digits than its factorization.

121516424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15189559 (or 15189555 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

The square root of 121516424 is about 11023.4488251182. The cubic root of 121516424 is about 495.3114035522.

The spelling of 121516424 in words is "one hundred twenty-one million, five hundred sixteen thousand, four hundred twenty-four".