21235532 has 24 divisors (see below), whose sum is σ = 39336192. Its totient is φ = 10010000.

The previous prime is 21235523. The next prime is 21235537. The reversal of 21235532 is 23553212.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a junction number, because it is equal to n+sod(n) for n = 21235498 and 21235507.

It is not an unprimeable number, because it can be changed into a prime (21235537) 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, 4907 + ... + 8157.

It is an arithmetic number, because the mean of its divisors is an integer number (1639008).

Almost surely, 2^21235532 is an apocalyptic number.

It is an amenable number.

21235532 is a deficient number, since it is larger than the sum of its proper divisors (18100660).

21235532 is a wasteful number, since it uses less digits than its factorization.

21235532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3349 (or 3347 counting only the distinct ones).

The product of its digits is 1800, while the sum is 23.

The square root of 21235532 is about 4608.2026865146. The cubic root of 21235532 is about 276.9200375656.

Adding to 21235532 its reverse (23553212), we get a palindrome (44788744).

The spelling of 21235532 in words is "twenty-one million, two hundred thirty-five thousand, five hundred thirty-two".