21315230000 has 200 divisors, whose sum is σ = 53210354736. Its totient is φ = 8265600000.

The previous prime is 21315229927. The next prime is 21315230017. The reversal of 21315230000 is 3251312.

It is a tau number, because it is divible by the number of its divisors (200).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 50629790 + ... + 50630210.

Almost surely, 2^21315230000 is an apocalyptic number.

21315230000 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 21315230000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26605177368).

21315230000 is an abundant number, since it is smaller than the sum of its proper divisors (31895124736).

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

21315230000 is an equidigital number, since it uses as much as digits as its factorization.

21315230000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593 (or 572 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

Adding to 21315230000 its reverse (3251312), we get a palindrome (21318481312).

The spelling of 21315230000 in words is "twenty-one billion, three hundred fifteen million, two hundred thirty thousand".