21063983 has 2 divisors, whose sum is σ = 21063984. Its totient is φ = 21063982.

The previous prime is 21063907. The next prime is 21063997. The reversal of 21063983 is 38936012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21063983 - 2¹⁰ = 21062959 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21063083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10531991 + 10531992.

It is an arithmetic number, because the mean of its divisors is an integer number (10531992).

Almost surely, 2^21063983 is an apocalyptic number.

21063983 is a deficient number, since it is larger than the sum of its proper divisors (1).

21063983 is an equidigital number, since it uses as much as digits as its factorization.

21063983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 21063983 is about 4589.5515031428. The cubic root of 21063983 is about 276.1723307648.

Adding to 21063983 its reverse (38936012), we get a palindrome (59999995).

The spelling of 21063983 in words is "twenty-one million, sixty-three thousand, nine hundred eighty-three".