21035124 has 72 divisors (see below), whose sum is σ = 58618560. Its totient is φ = 6359760.

The previous prime is 21035123. The next prime is 21035149. The reversal of 21035124 is 42153012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21035097 and 21035106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035123) 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 23 ways as a sum of consecutive naturals, for example, 47697 + ... + 48135.

Almost surely, 2^21035124 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 21035124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29309280).

21035124 is an abundant number, since it is smaller than the sum of its proper divisors (37583436).

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

21035124 is a wasteful number, since it uses less digits than its factorization.

21035124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482 (or 455 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21035124 is about 4586.4064364162. The cubic root of 21035124 is about 276.0461485530.

Adding to 21035124 its reverse (42153012), we get a palindrome (63188136).

It can be divided in two parts, 2103 and 5124, that added together give a palindrome (7227).

The spelling of 21035124 in words is "twenty-one million, thirty-five thousand, one hundred twenty-four".