21333308 has 6 divisors (see below), whose sum is σ = 37333296. Its totient is φ = 10666652.

The previous prime is 21333271. The next prime is 21333329. The reversal of 21333308 is 80333312.

It is a super-2 number, since 2×21333308² = 910220060445728, which contains 22 as substring.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 2666660 + ... + 2666667.

It is an arithmetic number, because the mean of its divisors is an integer number (6222216).

Almost surely, 2^21333308 is an apocalyptic number.

It is an amenable number.

21333308 is a deficient number, since it is larger than the sum of its proper divisors (15999988).

21333308 is a wasteful number, since it uses less digits than its factorization.

21333308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5333331 (or 5333329 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 21333308 is about 4618.7994111024. The cubic root of 21333308 is about 277.3443999580.

The spelling of 21333308 in words is "twenty-one million, three hundred thirty-three thousand, three hundred eight".