21335132 has 24 divisors (see below), whose sum is σ = 45953376. Its totient is φ = 8440128.

The previous prime is 21335123. The next prime is 21335137. The reversal of 21335132 is 23153312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21335137) 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 7 ways as a sum of consecutive naturals, for example, 28943 + ... + 29670.

It is an arithmetic number, because the mean of its divisors is an integer number (1914724).

Almost surely, 2^21335132 is an apocalyptic number.

It is an amenable number.

21335132 is an abundant number, since it is smaller than the sum of its proper divisors (24618244).

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

21335132 is a wasteful number, since it uses less digits than its factorization.

21335132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58637 (or 58635 counting only the distinct ones).

The product of its digits is 540, while the sum is 20.

The square root of 21335132 is about 4618.9968607913. The cubic root of 21335132 is about 277.3523040575.

Adding to 21335132 its reverse (23153312), we get a palindrome (44488444).

The spelling of 21335132 in words is "twenty-one million, three hundred thirty-five thousand, one hundred thirty-two".