21333055 has 4 divisors (see below), whose sum is σ = 25599672. Its totient is φ = 17066440.

The previous prime is 21333049. The next prime is 21333073. The reversal of 21333055 is 55033312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21333055 - 2³ = 21333047 is a prime.

It is a Duffinian number.

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, 2133301 + ... + 2133310.

It is an arithmetic number, because the mean of its divisors is an integer number (6399918).

Almost surely, 2^21333055 is an apocalyptic number.

21333055 is a deficient number, since it is larger than the sum of its proper divisors (4266617).

21333055 is an equidigital number, since it uses as much as digits as its factorization.

21333055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4266616.

The product of its (nonzero) digits is 1350, while the sum is 22.

The square root of 21333055 is about 4618.7720229516. The cubic root of 21333055 is about 277.3433035753.

Adding to 21333055 its reverse (55033312), we get a palindrome (76366367).

The spelling of 21333055 in words is "twenty-one million, three hundred thirty-three thousand, fifty-five".