21153332 has 12 divisors (see below), whose sum is σ = 37097760. Its totient is φ = 10553976.

The previous prime is 21153323. The next prime is 21153347. The reversal of 21153332 is 23335112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3482 + ... + 7377.

It is an arithmetic number, because the mean of its divisors is an integer number (3091480).

Almost surely, 2^21153332 is an apocalyptic number.

It is an amenable number.

21153332 is a deficient number, since it is larger than the sum of its proper divisors (15944428).

21153332 is a wasteful number, since it uses less digits than its factorization.

21153332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11350 (or 11348 counting only the distinct ones).

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

The square root of 21153332 is about 4599.2751602834. The cubic root of 21153332 is about 276.5622683156.

Adding to 21153332 its reverse (23335112), we get a palindrome (44488444).

The spelling of 21153332 in words is "twenty-one million, one hundred fifty-three thousand, three hundred thirty-two".