2121641 has 4 divisors (see below), whose sum is σ = 2156484. Its totient is φ = 2086800.

The previous prime is 2121631. The next prime is 2121653. The reversal of 2121641 is 1461212.

2121641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 326041 + 1795600 = 571^2 + 1340^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121641 - 2¹⁸ = 1859497 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 17330 + ... + 17451.

It is an arithmetic number, because the mean of its divisors is an integer number (539121).

2^2121641 is an apocalyptic number.

It is an amenable number.

2121641 is a deficient number, since it is larger than the sum of its proper divisors (34843).

2121641 is an equidigital number, since it uses as much as digits as its factorization.

2121641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34842.

The product of its digits is 96, while the sum is 17.

The square root of 2121641 is about 1456.5853905625. The cubic root of 2121641 is about 128.4963031433.

Adding to 2121641 its reverse (1461212), we get a palindrome (3582853).

The spelling of 2121641 in words is "two million, one hundred twenty-one thousand, six hundred forty-one".