4022521 has 8 divisors (see below), whose sum is σ = 4151840. Its totient is φ = 3894912.

The previous prime is 4022507. The next prime is 4022549. The reversal of 4022521 is 1252204.

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

It is a cyclic number.

It is not a de Polignac number, because 4022521 - 2¹⁷ = 3891449 is a prime.

It is a Duffinian number.

4022521 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4022495 and 4022504.

It is not an unprimeable number, because it can be changed into a prime (4022581) 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, 5641 + ... + 6313.

It is an arithmetic number, because the mean of its divisors is an integer number (518980).

Almost surely, 2^4022521 is an apocalyptic number.

It is an amenable number.

4022521 is a deficient number, since it is larger than the sum of its proper divisors (129319).

4022521 is a wasteful number, since it uses less digits than its factorization.

4022521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 4022521 is about 2005.6223473027. The cubic root of 4022521 is about 159.0374633187.

Adding to 4022521 its reverse (1252204), we get a palindrome (5274725).

The spelling of 4022521 in words is "four million, twenty-two thousand, five hundred twenty-one".