12121917 has 8 divisors (see below), whose sum is σ = 16197696. Its totient is φ = 8063712.

The previous prime is 12121883. The next prime is 12121927. The reversal of 12121917 is 71912121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12121917 - 2⁸ = 12121661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2688 + ... + 5609.

It is an arithmetic number, because the mean of its divisors is an integer number (2024712).

Almost surely, 2^12121917 is an apocalyptic number.

It is an amenable number.

12121917 is a deficient number, since it is larger than the sum of its proper divisors (4075779).

12121917 is an equidigital number, since it uses as much as digits as its factorization.

12121917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8787.

The product of its digits is 252, while the sum is 24.

The square root of 12121917 is about 3481.6543481512. The cubic root of 12121917 is about 229.7155715332.

The spelling of 12121917 in words is "twelve million, one hundred twenty-one thousand, nine hundred seventeen".