2121863 has 8 divisors (see below), whose sum is σ = 2249520. Its totient is φ = 1995840.

The previous prime is 2121853. The next prime is 2121869. The reversal of 2121863 is 3681212.

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 2121863 - 2⁸ = 2121607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121869) 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 7 ways as a sum of consecutive naturals, for example, 3131 + ... + 3747.

It is an arithmetic number, because the mean of its divisors is an integer number (281190).

2^2121863 is an apocalyptic number.

2121863 is a deficient number, since it is larger than the sum of its proper divisors (127657).

2121863 is a wasteful number, since it uses less digits than its factorization.

2121863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817.

The product of its digits is 576, while the sum is 23.

The square root of 2121863 is about 1456.6615941941. The cubic root of 2121863 is about 128.5007847661.

The spelling of 2121863 in words is "two million, one hundred twenty-one thousand, eight hundred sixty-three".