21383763 has 12 divisors (see below), whose sum is σ = 28934280. Its totient is φ = 14045856.

The previous prime is 21383753. The next prime is 21383777. The reversal of 21383763 is 36738312.

It is not a de Polignac number, because 21383763 - 2⁶ = 21383699 is a prime.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21383723) 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 11 ways as a sum of consecutive naturals, for example, 75420 + ... + 75702.

It is an arithmetic number, because the mean of its divisors is an integer number (2411190).

Almost surely, 2^21383763 is an apocalyptic number.

21383763 is a deficient number, since it is larger than the sum of its proper divisors (7550517).

21383763 is an frugal number, since it uses more digits than its factorization.

21383763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658 (or 375 counting only the distinct ones).

The product of its digits is 18144, while the sum is 33.

The square root of 21383763 is about 4624.2581026582. The cubic root of 21383763 is about 277.5628751287.

The spelling of 21383763 in words is "twenty-one million, three hundred eighty-three thousand, seven hundred sixty-three".