21000002009983 has 2 divisors, whose sum is σ = 21000002009984. Its totient is φ = 21000002009982.

The previous prime is 21000002009953. The next prime is 21000002010059. The reversal of 21000002009983 is 38990020000012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21000002009983 - 2²⁵ = 20999968455551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000002009933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500001004991 + 10500001004992.

It is an arithmetic number, because the mean of its divisors is an integer number (10500001004992).

Almost surely, 2^{21000002009983} is an apocalyptic number.

21000002009983 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000002009983 is an equidigital number, since it uses as much as digits as its factorization.

21000002009983 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

Adding to 21000002009983 its reverse (38990020000012), we get a palindrome (59990022009995).

The spelling of 21000002009983 in words is "twenty-one trillion, two million, nine thousand, nine hundred eighty-three".