21204130000 has 100 divisors (see below), whose sum is σ = 51506965620. Its totient is φ = 8453632000.

The previous prime is 21204129959. The next prime is 21204130069. The reversal of 21204130000 is 3140212.

It can be written as a sum of positive squares in 10 ways, for example, as 17809436304 + 3394693696 = 133452^2 + 58264^2 .

It is a tau number, because it is divible by the number of its divisors (100).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3166656 + ... + 3173344.

Almost surely, 2^21204130000 is an apocalyptic number.

21204130000 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 21204130000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25753482810).

21204130000 is an abundant number, since it is smaller than the sum of its proper divisors (30302835620).

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

21204130000 is an equidigital number, since it uses as much as digits as its factorization.

21204130000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7034 (or 7013 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21204130000 its reverse (3140212), we get a palindrome (21207270212).

The spelling of 21204130000 in words is "twenty-one billion, two hundred four million, one hundred thirty thousand".