21098520360 has 640 divisors, whose sum is σ = 78460272000. Its totient is φ = 5065721856.

The previous prime is 21098520349. The next prime is 21098520367. The reversal of 21098520360 is 6302589012.

21098520360 is a `hidden beast` number, since 2 + 10 + 98 + 520 + 36 + 0 = 666.

It is a super-2 number, since 2×21098520360² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21098520367) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 134385402 + ... + 134385558.

It is an arithmetic number, because the mean of its divisors is an integer number (122594175).

Almost surely, 2^21098520360 is an apocalyptic number.

21098520360 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 21098520360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39230136000).

21098520360 is an abundant number, since it is smaller than the sum of its proper divisors (57361751640).

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

21098520360 is a wasteful number, since it uses less digits than its factorization.

21098520360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295 (or 282 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 21098520360 in words is "twenty-one billion, ninety-eight million, five hundred twenty thousand, three hundred sixty".