2236521 has 8 divisors (see below), whose sum is σ = 3408064. Its totient is φ = 1278000.

The previous prime is 2236519. The next prime is 2236573. The reversal of 2236521 is 1256322.

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

It is not a de Polignac number, because 2236521 - 2¹ = 2236519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 106501 = 2236521 / (2 + 2 + 3 + 6 + 5 + 2 + 1).

It is a d-powerful number, because it can be written as 2⁴ + 2⁸ + 3⁹ + 6⁴ + 5⁹ + 2¹⁸ + 1 .

It is the 1496-th Hogben number.

It is a Duffinian number.

2236521 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2236511) by changing a digit.

It is a nontrivial repunit in base 1495.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53230 + ... + 53271.

It is an arithmetic number, because the mean of its divisors is an integer number (426008).

2^2236521 is an apocalyptic number.

2236521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2236521 is a deficient number, since it is larger than the sum of its proper divisors (1171543).

2236521 is a wasteful number, since it uses less digits than its factorization.

2236521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106511.

The product of its digits is 720, while the sum is 21.

The square root of 2236521 is about 1495.5002507522. The cubic root of 2236521 is about 130.7748789770.

The spelling of 2236521 in words is "two million, two hundred thirty-six thousand, five hundred twenty-one".