21035144 has 32 divisors (see below), whose sum is σ = 42712320. Its totient is φ = 9654336.

The previous prime is 21035123. The next prime is 21035149. The reversal of 21035144 is 44153012.

It is not an unprimeable number, because it can be changed into a prime (21035149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22739 + ... + 23645.

It is an arithmetic number, because the mean of its divisors is an integer number (1334760).

Almost surely, 2^21035144 is an apocalyptic number.

It is an amenable number.

21035144 is an abundant number, since it is smaller than the sum of its proper divisors (21677176).

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

21035144 is a wasteful number, since it uses less digits than its factorization.

21035144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149 (or 1145 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21035144 is about 4586.4086167720. The cubic root of 21035144 is about 276.0462360403.

Adding to 21035144 its reverse (44153012), we get a palindrome (65188156).

The spelling of 21035144 in words is "twenty-one million, thirty-five thousand, one hundred forty-four".