2121917 has 8 divisors (see below), whose sum is σ = 2448576. Its totient is φ = 1801152.

The previous prime is 2121907. The next prime is 2121941. The reversal of 2121917 is 7191212.

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

It is a cyclic number.

It is not a de Polignac number, because 2121917 - 2⁶ = 2121853 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121892 and 2121901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121907) 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, 668 + ... + 2165.

It is an arithmetic number, because the mean of its divisors is an integer number (306072).

2^2121917 is an apocalyptic number.

It is an amenable number.

2121917 is a deficient number, since it is larger than the sum of its proper divisors (326659).

2121917 is a wasteful number, since it uses less digits than its factorization.

2121917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2947.

The product of its digits is 252, while the sum is 23.

The square root of 2121917 is about 1456.6801296098. The cubic root of 2121917 is about 128.5018748433.

The spelling of 2121917 in words is "two million, one hundred twenty-one thousand, nine hundred seventeen".