4821521 has 4 divisors (see below), whose sum is σ = 4893552. Its totient is φ = 4749492.

The previous prime is 4821517. The next prime is 4821529. The reversal of 4821521 is 1251284.

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 4821521 - 2² = 4821517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4821529) 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, 35915 + ... + 36048.

It is an arithmetic number, because the mean of its divisors is an integer number (1223388).

Almost surely, 2^4821521 is an apocalyptic number.

It is an amenable number.

4821521 is a deficient number, since it is larger than the sum of its proper divisors (72031).

4821521 is an equidigital number, since it uses as much as digits as its factorization.

4821521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72030.

The product of its digits is 640, while the sum is 23.

The square root of 4821521 is about 2195.7962109449. The cubic root of 4821521 is about 168.9382615891.

The spelling of 4821521 in words is "four million, eight hundred twenty-one thousand, five hundred twenty-one".