21235032 has 144 divisors (see below), whose sum is σ = 72203040. Its totient is φ = 5588352.

The previous prime is 21235021. The next prime is 21235037. The reversal of 21235032 is 23053212.

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 = 21234996 and 21235014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21235037) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 45633 + ... + 46095.

It is an arithmetic number, because the mean of its divisors is an integer number (501410).

Almost surely, 2^21235032 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 21235032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36101520).

21235032 is an abundant number, since it is smaller than the sum of its proper divisors (50968008).

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

21235032 is a wasteful number, since it uses less digits than its factorization.

21235032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502 (or 488 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 21235032 is about 4608.1484351093. The cubic root of 21235032 is about 276.9178641469.

Adding to 21235032 its reverse (23053212), we get a palindrome (44288244).

The spelling of 21235032 in words is "twenty-one million, two hundred thirty-five thousand, thirty-two".