21053032 has 96 divisors (see below), whose sum is σ = 53625600. Its totient is φ = 7539840.

The previous prime is 21053017. The next prime is 21053041. The reversal of 21053032 is 23035012.

It is a junction number, because it is equal to n+sod(n) for n = 21052997 and 21053015.

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 23 ways as a sum of consecutive naturals, for example, 87969 + ... + 88207.

It is an arithmetic number, because the mean of its divisors is an integer number (558600).

Almost surely, 2^21053032 is an apocalyptic number.

21053032 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21053032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26812800).

21053032 is an abundant number, since it is smaller than the sum of its proper divisors (32572568).

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

21053032 is a wasteful number, since it uses less digits than its factorization.

21053032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287 (or 272 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 21053032 is about 4588.3583120763. The cubic root of 21053032 is about 276.1244625236.

Adding to 21053032 its reverse (23035012), we get a palindrome (44088044).

The spelling of 21053032 in words is "twenty-one million, fifty-three thousand, thirty-two".