2121638 has 8 divisors (see below), whose sum is σ = 3188640. Its totient is φ = 1058760.

The previous prime is 2121631. The next prime is 2121653. The reversal of 2121638 is 8361212.

2121638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1523 + ... + 2561.

It is an arithmetic number, because the mean of its divisors is an integer number (398580).

2^2121638 is an apocalyptic number.

2121638 is a deficient number, since it is larger than the sum of its proper divisors (1067002).

2121638 is a wasteful number, since it uses less digits than its factorization.

2121638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2062.

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

The square root of 2121638 is about 1456.5843607564. The cubic root of 2121638 is about 128.4962425786.

The spelling of 2121638 in words is "two million, one hundred twenty-one thousand, six hundred thirty-eight".