2121217 has 16 divisors (see below), whose sum is σ = 2620800. Its totient is φ = 1676160.

The previous prime is 2121199. The next prime is 2121239. The reversal of 2121217 is 7121212.

2121217 = T₄₆₃ + T₄₆₄ + ... + T₄₈₁.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121217 is a prime.

It is a super-2 number, since 2×2121217² = 8999123122178, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2121217.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5259 + ... + 5647.

It is an arithmetic number, because the mean of its divisors is an integer number (163800).

2^2121217 is an apocalyptic number.

It is an amenable number.

2121217 is a deficient number, since it is larger than the sum of its proper divisors (499583).

2121217 is a wasteful number, since it uses less digits than its factorization.

2121217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456.

The product of its digits is 56, while the sum is 16.

The square root of 2121217 is about 1456.4398374118. The cubic root of 2121217 is about 128.4877427785.

Adding to 2121217 its reverse (7121212), we get a palindrome (9242429).

The spelling of 2121217 in words is "two million, one hundred twenty-one thousand, two hundred seventeen".