21007419683 has 2 divisors, whose sum is σ = 21007419684. Its totient is φ = 21007419682.

The previous prime is 21007419623. The next prime is 21007419733. The reversal of 21007419683 is 38691470012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21007419683 - 2⁶ = 21007419619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21007419683.

It is not a weakly prime, because it can be changed into another prime (21007419613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10503709841 + 10503709842.

It is an arithmetic number, because the mean of its divisors is an integer number (10503709842).

Almost surely, 2^21007419683 is an apocalyptic number.

21007419683 is a deficient number, since it is larger than the sum of its proper divisors (1).

21007419683 is an equidigital number, since it uses as much as digits as its factorization.

21007419683 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 41.

Adding to 21007419683 its reverse (38691470012), we get a palindrome (59698889695).

The spelling of 21007419683 in words is "twenty-one billion, seven million, four hundred nineteen thousand, six hundred eighty-three".