2121621 has 8 divisors (see below), whose sum is σ = 2840640. Its totient is φ = 1408512.

The previous prime is 2121619. The next prime is 2121631. The reversal of 2121621 is 1261212.

2121621 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 not a de Polignac number, because 2121621 - 2¹ = 2121619 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121601) 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 7 ways as a sum of consecutive naturals, for example, 556 + ... + 2133.

It is an arithmetic number, because the mean of its divisors is an integer number (355080).

2^2121621 is an apocalyptic number.

It is an amenable number.

2121621 is a deficient number, since it is larger than the sum of its proper divisors (719019).

2121621 is a wasteful number, since it uses less digits than its factorization.

2121621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2955.

The product of its digits is 48, while the sum is 15.

The square root of 2121621 is about 1456.5785251747. The cubic root of 2121621 is about 128.4958993781.

Adding to 2121621 its reverse (1261212), we get a palindrome (3382833).

The spelling of 2121621 in words is "two million, one hundred twenty-one thousand, six hundred twenty-one".