21035224 has 32 divisors (see below), whose sum is σ = 45396000. Its totient is φ = 8951040.

The previous prime is 21035219. The next prime is 21035227. The reversal of 21035224 is 42253012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035227) by changing a digit.

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, 7084 + ... + 9604.

It is an arithmetic number, because the mean of its divisors is an integer number (1418625).

Almost surely, 2^21035224 is an apocalyptic number.

It is an amenable number.

21035224 is an abundant number, since it is smaller than the sum of its proper divisors (24360776).

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

21035224 is a wasteful number, since it uses less digits than its factorization.

21035224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2683 (or 2679 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21035224 is about 4586.4173381846. The cubic root of 21035224 is about 276.0465859891.

Adding to 21035224 its reverse (42253012), we get a palindrome (63288236).

The spelling of 21035224 in words is "twenty-one million, thirty-five thousand, two hundred twenty-four".