21333105 has 32 divisors (see below), whose sum is σ = 39926400. Its totient is φ = 10777536.

The previous prime is 21333097. The next prime is 21333107. The reversal of 21333105 is 50133312.

It is not a de Polignac number, because 21333105 - 2³ = 21333097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21333107) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1594 + ... + 6723.

It is an arithmetic number, because the mean of its divisors is an integer number (1247700).

Almost surely, 2^21333105 is an apocalyptic number.

It is an amenable number.

21333105 is a deficient number, since it is larger than the sum of its proper divisors (18593295).

21333105 is a wasteful number, since it uses less digits than its factorization.

21333105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8350 (or 8344 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 18.

The square root of 21333105 is about 4618.7774356425. Note that the first 3 decimals coincide. The cubic root of 21333105 is about 277.3435202524.

Adding to 21333105 its reverse (50133312), we get a palindrome (71466417).

The spelling of 21333105 in words is "twenty-one million, three hundred thirty-three thousand, one hundred five".