4321921 has 4 divisors (see below), whose sum is σ = 4327344. Its totient is φ = 4316500.

The previous prime is 4321901. The next prime is 4321931. The reversal of 4321921 is 1291234.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4321921 - 2¹¹ = 4319873 is a prime.

It is a super-2 number, since 2×4321921² = 37358002260482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4321892 and 4321901.

It is not an unprimeable number, because it can be changed into a prime (4321901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1255 + ... + 3196.

It is an arithmetic number, because the mean of its divisors is an integer number (1081836).

Almost surely, 2^4321921 is an apocalyptic number.

It is an amenable number.

4321921 is a deficient number, since it is larger than the sum of its proper divisors (5423).

4321921 is an equidigital number, since it uses as much as digits as its factorization.

4321921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5422.

The product of its digits is 432, while the sum is 22.

The square root of 4321921 is about 2078.9230384985. The cubic root of 4321921 is about 162.8891941417.

The spelling of 4321921 in words is "four million, three hundred twenty-one thousand, nine hundred twenty-one".