21302100000 has 216 divisors, whose sum is σ = 75720661380. Its totient is φ = 5680320000.

The previous prime is 21302099999. The next prime is 21302100013. The reversal of 21302100000 is 120312.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 3773399184 + 17528700816 = 61428^2 + 132396^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 888166 + ... + 911834.

Almost surely, 2^21302100000 is an apocalyptic number.

21302100000 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 21302100000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37860330690).

21302100000 is an abundant number, since it is smaller than the sum of its proper divisors (54418561380).

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

21302100000 is an equidigital number, since it uses as much as digits as its factorization.

21302100000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23710 (or 23679 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 21302100000 its reverse (120312), we get a palindrome (21302220312).

The spelling of 21302100000 in words is "twenty-one billion, three hundred two million, one hundred thousand".