121993616 has 10 divisors (see below), whose sum is σ = 236362662. Its totient is φ = 60996800.

The previous prime is 121993603. The next prime is 121993637. The reversal of 121993616 is 616399121.

It can be written as a sum of positive squares in only one way, i.e., 120912016 + 1081600 = 10996^2 + 1040^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 121993616.

It is an unprimeable number.

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, 3812285 + ... + 3812316.

Almost surely, 2^121993616 is an apocalyptic number.

121993616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121993616 is a deficient number, since it is larger than the sum of its proper divisors (114369046).

121993616 is an equidigital number, since it uses as much as digits as its factorization.

121993616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7624609 (or 7624603 counting only the distinct ones).

The product of its digits is 17496, while the sum is 38.

The square root of 121993616 is about 11045.0720233052. The cubic root of 121993616 is about 495.9589152581.

The spelling of 121993616 in words is "one hundred twenty-one million, nine hundred ninety-three thousand, six hundred sixteen".