121917616 has 20 divisors (see below), whose sum is σ = 237540600. Its totient is φ = 60616832.

The previous prime is 121917613. The next prime is 121917617. The reversal of 121917616 is 616719121.

It is a super-2 number, since 2×121917616² = 29727810182246912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121917613) 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, 18421 + ... + 24148.

It is an arithmetic number, because the mean of its divisors is an integer number (11877030).

Almost surely, 2^121917616 is an apocalyptic number.

121917616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121917616 is a deficient number, since it is larger than the sum of its proper divisors (115622984).

121917616 is a wasteful number, since it uses less digits than its factorization.

121917616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42756 (or 42750 counting only the distinct ones).

The product of its digits is 4536, while the sum is 34.

The square root of 121917616 is about 11041.6310389362. The cubic root of 121917616 is about 495.8559024698.

The spelling of 121917616 in words is "one hundred twenty-one million, nine hundred seventeen thousand, six hundred sixteen".