4509021 has 16 divisors (see below), whose sum is σ = 6612480. Its totient is φ = 2710320.

The previous prime is 4509019. The next prime is 4509047. The reversal of 4509021 is 1209054.

It is not a de Polignac number, because 4509021 - 2¹ = 4509019 is a prime.

4509021 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4502021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4096 + ... + 5078.

It is an arithmetic number, because the mean of its divisors is an integer number (413280).

Almost surely, 2^4509021 is an apocalyptic number.

It is an amenable number.

4509021 is a deficient number, since it is larger than the sum of its proper divisors (2103459).

4509021 is a wasteful number, since it uses less digits than its factorization.

4509021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 4509021 is about 2123.4455491017. The cubic root of 4509021 is about 165.2066098659.

Multiplying 4509021 by its sum of digits (21), we get a triangular number (94689441 = T₁₃₇₆₁).

The spelling of 4509021 in words is "four million, five hundred nine thousand, twenty-one".