21406489598 has 16 divisors (see below), whose sum is σ = 34701915696. Its totient is φ = 9845003520.

The previous prime is 21406489583. The next prime is 21406489609. The reversal of 21406489598 is 89598460412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1447283 + ... + 1461998.

It is an arithmetic number, because the mean of its divisors is an integer number (2168869731).

Almost surely, 2^21406489598 is an apocalyptic number.

21406489598 is a deficient number, since it is larger than the sum of its proper divisors (13295426098).

21406489598 is a wasteful number, since it uses less digits than its factorization.

21406489598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2909579.

The product of its (nonzero) digits is 4976640, while the sum is 56.

The spelling of 21406489598 in words is "twenty-one billion, four hundred six million, four hundred eighty-nine thousand, five hundred ninety-eight".