21268055 has 8 divisors (see below), whose sum is σ = 25723392. Its totient is φ = 16879968.

The previous prime is 21268033. The next prime is 21268057. The reversal of 21268055 is 55086212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21268055 - 2¹⁰ = 21267031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21268057) 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 7 ways as a sum of consecutive naturals, for example, 16112 + ... + 17381.

It is an arithmetic number, because the mean of its divisors is an integer number (3215424).

Almost surely, 2^21268055 is an apocalyptic number.

21268055 is a deficient number, since it is larger than the sum of its proper divisors (4455337).

21268055 is a wasteful number, since it uses less digits than its factorization.

21268055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33625.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 21268055 is about 4611.7301525566. The cubic root of 21268055 is about 277.0613365368.

The spelling of 21268055 in words is "twenty-one million, two hundred sixty-eight thousand, fifty-five".