21180600000 has 756 divisors, whose sum is σ = 88890341904. Its totient is φ = 4723200000.

The previous prime is 21180599911. The next prime is 21180600017. The reversal of 21180600000 is 608112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 516599980 + ... + 516600020.

Almost surely, 2^21180600000 is an apocalyptic number.

21180600000 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 21180600000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44445170952).

21180600000 is an abundant number, since it is smaller than the sum of its proper divisors (67709741904).

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

21180600000 is an frugal number, since it uses more digits than its factorization.

21180600000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 58 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The spelling of 21180600000 in words is "twenty-one billion, one hundred eighty million, six hundred thousand".