21035472 has 40 divisors (see below), whose sum is σ = 54892320. Its totient is φ = 6940800.

The previous prime is 21035459. The next prime is 21035491. The reversal of 21035472 is 27453012.

It is a Harshad number since it is a multiple of its sum of digits (24).

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 7 ways as a sum of consecutive naturals, for example, 2679 + ... + 7017.

It is an arithmetic number, because the mean of its divisors is an integer number (1372308).

Almost surely, 2^21035472 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 21035472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27446160).

21035472 is an abundant number, since it is smaller than the sum of its proper divisors (33856848).

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

21035472 is a wasteful number, since it uses less digits than its factorization.

21035472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4451 (or 4445 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 21035472 is about 4586.4443744583. Note that the first 3 decimals coincide. The cubic root of 21035472 is about 276.0476708248.

Adding to 21035472 its reverse (27453012), we get a palindrome (48488484).

The spelling of 21035472 in words is "twenty-one million, thirty-five thousand, four hundred seventy-two".