21406489583 has 2 divisors, whose sum is σ = 21406489584. Its totient is φ = 21406489582.

The previous prime is 21406489571. The next prime is 21406489609. The reversal of 21406489583 is 38598460412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21406489583 - 2¹⁴ = 21406473199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21406489483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10703244791 + 10703244792.

It is an arithmetic number, because the mean of its divisors is an integer number (10703244792).

Almost surely, 2^21406489583 is an apocalyptic number.

21406489583 is a deficient number, since it is larger than the sum of its proper divisors (1).

21406489583 is an equidigital number, since it uses as much as digits as its factorization.

21406489583 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1658880, while the sum is 50.

The spelling of 21406489583 in words is "twenty-one billion, four hundred six million, four hundred eighty-nine thousand, five hundred eighty-three".