21598989489 has 96 divisors (see below), whose sum is σ = 40513824000. Its totient is φ = 10759150080.

The previous prime is 21598989479. The next prime is 21598989491. The reversal of 21598989489 is 98498989512.

21598989489 is a `hidden beast` number, since 2 + 1 + 59 + 8 + 98 + 9 + 489 = 666.

It is not a de Polignac number, because 21598989489 - 2¹² = 21598985393 is a prime.

It is a super-2 number, since 2×21598989489² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21598989439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2990847 + ... + 2998059.

It is an arithmetic number, because the mean of its divisors is an integer number (422019000).

Almost surely, 2^21598989489 is an apocalyptic number.

21598989489 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

21598989489 is a deficient number, since it is larger than the sum of its proper divisors (18914834511).

21598989489 is a wasteful number, since it uses less digits than its factorization.

21598989489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7415 (or 7412 counting only the distinct ones).

The product of its digits is 134369280, while the sum is 72.

The spelling of 21598989489 in words is "twenty-one billion, five hundred ninety-eight million, nine hundred eighty-nine thousand, four hundred eighty-nine".