21983763 has 4 divisors (see below), whose sum is σ = 29311688. Its totient is φ = 14655840.

The previous prime is 21983747. The next prime is 21983807. The reversal of 21983763 is 36738912.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21983763 - 2⁴ = 21983747 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (21981763) 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 3 ways as a sum of consecutive naturals, for example, 3663958 + ... + 3663963.

It is an arithmetic number, because the mean of its divisors is an integer number (7327922).

Almost surely, 2^21983763 is an apocalyptic number.

21983763 is a deficient number, since it is larger than the sum of its proper divisors (7327925).

21983763 is an equidigital number, since it uses as much as digits as its factorization.

21983763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7327924.

The product of its digits is 54432, while the sum is 39.

The square root of 21983763 is about 4688.6845703246. The cubic root of 21983763 is about 280.1349816866.

The spelling of 21983763 in words is "twenty-one million, nine hundred eighty-three thousand, seven hundred sixty-three".