2521224 has 72 divisors (see below), whose sum is σ = 7280910. Its totient is φ = 787968.

The previous prime is 2521223. The next prime is 2521249. The reversal of 2521224 is 4221252.

It can be written as a sum of positive squares in only one way, i.e., 2196324 + 324900 = 1482^2 + 570^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 2521197 and 2521206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521223) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 25944 + ... + 26040.

2^2521224 is an apocalyptic number.

2521224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2521224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3640455).

2521224 is an abundant number, since it is smaller than the sum of its proper divisors (4759686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2521224 is a wasteful number, since it uses less digits than its factorization.

2521224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147 (or 121 counting only the distinct ones).

The product of its digits is 320, while the sum is 18.

The square root of 2521224 is about 1587.8362635990. The cubic root of 2521224 is about 136.1038710512.

Adding to 2521224 its reverse (4221252), we get a palindrome (6742476).

The spelling of 2521224 in words is "two million, five hundred twenty-one thousand, two hundred twenty-four".