21828452 has 6 divisors (see below), whose sum is σ = 38199798. Its totient is φ = 10914224.

The previous prime is 21828437. The next prime is 21828463. The reversal of 21828452 is 25482812.

It can be written as a sum of positive squares in only one way, i.e., 16192576 + 5635876 = 4024^2 + 2374^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2728553 + ... + 2728560.

It is an arithmetic number, because the mean of its divisors is an integer number (6366633).

Almost surely, 2^21828452 is an apocalyptic number.

It is an amenable number.

21828452 is a deficient number, since it is larger than the sum of its proper divisors (16371346).

21828452 is a wasteful number, since it uses less digits than its factorization.

21828452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5457117 (or 5457115 counting only the distinct ones).

The product of its digits is 10240, while the sum is 32.

The square root of 21828452 is about 4672.0928929121. The cubic root of 21828452 is about 279.4737223320.

The spelling of 21828452 in words is "twenty-one million, eight hundred twenty-eight thousand, four hundred fifty-two".