21035024 has 20 divisors (see below), whose sum is σ = 40940460. Its totient is φ = 10469760.

The previous prime is 21034999. The next prime is 21035029. The reversal of 21035024 is 42053012.

It can be written as a sum of positive squares in 2 ways, for example, as 15745024 + 5290000 = 3968^2 + 2300^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21034993 and 21035011.

It is not an unprimeable number, because it can be changed into a prime (21035029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 794 + ... + 6534.

It is an arithmetic number, because the mean of its divisors is an integer number (2047023).

Almost surely, 2^21035024 is an apocalyptic number.

It is an amenable number.

21035024 is a deficient number, since it is larger than the sum of its proper divisors (19905436).

21035024 is a wasteful number, since it uses less digits than its factorization.

21035024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5978 (or 5972 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 21035024 is about 4586.3955346219. The cubic root of 21035024 is about 276.0457111155.

Adding to 21035024 its reverse (42053012), we get a palindrome (63088036).

The spelling of 21035024 in words is "twenty-one million, thirty-five thousand, twenty-four".