21159888300 has 108 divisors (see below), whose sum is σ = 66473479800. Its totient is φ = 5629962240.

The previous prime is 21159888241. The next prime is 21159888307. The reversal of 21159888300 is 388895112.

It is a happy number.

21159888300 is a `hidden beast` number, since 21 + 1 + 598 + 8 + 8 + 30 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (21159888307) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 377919 + ... + 430281.

Almost surely, 2^21159888300 is an apocalyptic number.

21159888300 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 21159888300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33236739900).

21159888300 is an abundant number, since it is smaller than the sum of its proper divisors (45313591500).

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

21159888300 is a wasteful number, since it uses less digits than its factorization.

21159888300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52832 (or 52822 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The spelling of 21159888300 in words is "twenty-one billion, one hundred fifty-nine million, eight hundred eighty-eight thousand, three hundred".