21383285 has 16 divisors (see below), whose sum is σ = 31992192. Its totient is φ = 13329600.

The previous prime is 21383281. The next prime is 21383287. The reversal of 21383285 is 58238312.

It is not a de Polignac number, because 21383285 - 2² = 21383281 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 (21383281) 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 15 ways as a sum of consecutive naturals, for example, 27386 + ... + 28155.

It is an arithmetic number, because the mean of its divisors is an integer number (1999512).

Almost surely, 2^21383285 is an apocalyptic number.

It is an amenable number.

21383285 is a deficient number, since it is larger than the sum of its proper divisors (10608907).

21383285 is a wasteful number, since it uses less digits than its factorization.

21383285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55564.

The product of its digits is 11520, while the sum is 32.

The square root of 21383285 is about 4624.2064184031. The cubic root of 21383285 is about 277.5608069545.

The spelling of 21383285 in words is "twenty-one million, three hundred eighty-three thousand, two hundred eighty-five".