21489387683 has 2 divisors, whose sum is σ = 21489387684. Its totient is φ = 21489387682.

The previous prime is 21489387613. The next prime is 21489387691. The reversal of 21489387683 is 38678398412.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21489387683 - 2⁸ = 21489387427 is a prime.

It is not a weakly prime, because it can be changed into another prime (21489387613) 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 as a sum of consecutive naturals, namely, 10744693841 + 10744693842.

It is an arithmetic number, because the mean of its divisors is an integer number (10744693842).

Almost surely, 2^21489387683 is an apocalyptic number.

21489387683 is a deficient number, since it is larger than the sum of its proper divisors (1).

21489387683 is an equidigital number, since it uses as much as digits as its factorization.

21489387683 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13934592, while the sum is 59.

The spelling of 21489387683 in words is "twenty-one billion, four hundred eighty-nine million, three hundred eighty-seven thousand, six hundred eighty-three".