2121718 has 8 divisors (see below), whose sum is σ = 3189312. Its totient is φ = 1058616.

The previous prime is 2121683. The next prime is 2121737. The reversal of 2121718 is 8171212.

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

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 571 + ... + 2137.

It is an arithmetic number, because the mean of its divisors is an integer number (398664).

2^2121718 is an apocalyptic number.

2121718 is a deficient number, since it is larger than the sum of its proper divisors (1067594).

2121718 is a wasteful number, since it uses less digits than its factorization.

2121718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2246.

The product of its digits is 224, while the sum is 22.

The square root of 2121718 is about 1456.6118220034. The cubic root of 2121718 is about 128.4978576154.

The spelling of 2121718 in words is "two million, one hundred twenty-one thousand, seven hundred eighteen".