21302120000 has 140 divisors (see below), whose sum is σ = 60369175680. Its totient is φ = 7303488000.

The previous prime is 21302119987. The next prime is 21302120071. The reversal of 21302120000 is 2120312.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (140).

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, 241961 + ... + 318039.

Almost surely, 2^21302120000 is an apocalyptic number.

21302120000 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 21302120000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30184587840).

21302120000 is an abundant number, since it is smaller than the sum of its proper divisors (39067055680).

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

21302120000 is an frugal number, since it uses more digits than its factorization.

21302120000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76118 (or 76093 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 21302120000 its reverse (2120312), we get a palindrome (21304240312).

The spelling of 21302120000 in words is "twenty-one billion, three hundred two million, one hundred twenty thousand".