4521921 has 8 divisors (see below), whose sum is σ = 6083040. Its totient is φ = 2987712.

The previous prime is 4521899. The next prime is 4521929. The reversal of 4521921 is 1291254.

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

It is not a de Polignac number, because 4521921 - 2⁵ = 4521889 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4521891 and 4521900.

It is not an unprimeable number, because it can be changed into a prime (4521929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6331 + ... + 7008.

It is an arithmetic number, because the mean of its divisors is an integer number (760380).

Almost surely, 2^4521921 is an apocalyptic number.

It is an amenable number.

4521921 is a deficient number, since it is larger than the sum of its proper divisors (1561119).

4521921 is a wasteful number, since it uses less digits than its factorization.

4521921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13455.

The product of its digits is 720, while the sum is 24.

The square root of 4521921 is about 2126.4808957524. The cubic root of 4521921 is about 165.3640081215.

The spelling of 4521921 in words is "four million, five hundred twenty-one thousand, nine hundred twenty-one".