21283452 has 48 divisors (see below), whose sum is σ = 56474880. Its totient is φ = 6927984.

The previous prime is 21283447. The next prime is 21283463. The reversal of 21283452 is 25438212.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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 in 15 ways as a sum of consecutive naturals, for example, 2353 + ... + 6935.

It is an arithmetic number, because the mean of its divisors is an integer number (1176560).

Almost surely, 2^21283452 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21283452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28237440).

21283452 is an abundant number, since it is smaller than the sum of its proper divisors (35191428).

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

21283452 is a wasteful number, since it uses less digits than its factorization.

21283452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4639 (or 4631 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 21283452 is about 4613.3991806476. The cubic root of 21283452 is about 277.1281798907.

The spelling of 21283452 in words is "twenty-one million, two hundred eighty-three thousand, four hundred fifty-two".