21498347520 has 360 divisors, whose sum is σ = 80293829616. Its totient is φ = 5289541632.

The previous prime is 21498347473. The next prime is 21498347531. The reversal of 21498347520 is 2574389412.

21498347520 is a `hidden beast` number, since 2 + 1 + 4 + 9 + 83 + 47 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9583519 + ... + 9585761.

Almost surely, 2^21498347520 is an apocalyptic number.

21498347520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21498347520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40146914808).

21498347520 is an abundant number, since it is smaller than the sum of its proper divisors (58795482096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21498347520 is a wasteful number, since it uses less digits than its factorization.

21498347520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2295 (or 2266 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 21498347520 in words is "twenty-one billion, four hundred ninety-eight million, three hundred forty-seven thousand, five hundred twenty".