21183055 has 16 divisors (see below), whose sum is σ = 26511840. Its totient is φ = 16232832.

The previous prime is 21183031. The next prime is 21183059. The reversal of 21183055 is 55038112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21183055 - 2⁷ = 21182927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21183059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11541 + ... + 13249.

It is an arithmetic number, because the mean of its divisors is an integer number (1656990).

Almost surely, 2^21183055 is an apocalyptic number.

21183055 is a deficient number, since it is larger than the sum of its proper divisors (5328785).

21183055 is a wasteful number, since it uses less digits than its factorization.

21183055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 21183055 is about 4602.5052960317. The cubic root of 21183055 is about 276.6917422152.

The spelling of 21183055 in words is "twenty-one million, one hundred eighty-three thousand, fifty-five".