21335055 has 32 divisors (see below), whose sum is σ = 39664128. Its totient is φ = 9590400.

The previous prime is 21335033. The next prime is 21335057. The reversal of 21335055 is 55053312.

It is not a de Polignac number, because 21335055 - 2⁵ = 21335023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21335057) 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 31 ways as a sum of consecutive naturals, for example, 4740 + ... + 8070.

It is an arithmetic number, because the mean of its divisors is an integer number (1239504).

Almost surely, 2^21335055 is an apocalyptic number.

21335055 is a deficient number, since it is larger than the sum of its proper divisors (18329073).

21335055 is a wasteful number, since it uses less digits than its factorization.

21335055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3407.

The product of its (nonzero) digits is 2250, while the sum is 24.

The square root of 21335055 is about 4618.9885256407. The cubic root of 21335055 is about 277.3519703958.

Adding to 21335055 its reverse (55053312), we get a palindrome (76388367).

The spelling of 21335055 in words is "twenty-one million, three hundred thirty-five thousand, fifty-five".