21041983 has 2 divisors, whose sum is σ = 21041984. Its totient is φ = 21041982.

The previous prime is 21041981. The next prime is 21041989. The reversal of 21041983 is 38914012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21041983 - 2¹ = 21041981 is a prime.

Together with 21041981, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21041981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520991 + 10520992.

It is an arithmetic number, because the mean of its divisors is an integer number (10520992).

Almost surely, 2^21041983 is an apocalyptic number.

21041983 is a deficient number, since it is larger than the sum of its proper divisors (1).

21041983 is an equidigital number, since it uses as much as digits as its factorization.

21041983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 21041983 is about 4587.1541286510. The cubic root of 21041983 is about 276.0761490857.

Adding to 21041983 its reverse (38914012), we get a palindrome (59955995).

The spelling of 21041983 in words is "twenty-one million, forty-one thousand, nine hundred eighty-three".