21406489599 has 16 divisors (see below), whose sum is σ = 31647153024. Its totient is φ = 12760946400.

The previous prime is 21406489583. The next prime is 21406489609. The reversal of 21406489599 is 99598460412.

It is not a de Polignac number, because 21406489599 - 2⁴ = 21406489583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21406489529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5315049 + ... + 5319074.

It is an arithmetic number, because the mean of its divisors is an integer number (1977947064).

Almost surely, 2^21406489599 is an apocalyptic number.

21406489599 is a deficient number, since it is larger than the sum of its proper divisors (10240663425).

21406489599 is a wasteful number, since it uses less digits than its factorization.

21406489599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10634198.

The product of its (nonzero) digits is 5598720, while the sum is 57.

The spelling of 21406489599 in words is "twenty-one billion, four hundred six million, four hundred eighty-nine thousand, five hundred ninety-nine".