21213000330 has 64 divisors (see below), whose sum is σ = 52717392000. Its totient is φ = 5456487680.

The previous prime is 21213000293. The next prime is 21213000343. The reversal of 21213000330 is 3300031212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 937996 + ... + 960344.

It is an arithmetic number, because the mean of its divisors is an integer number (823709250).

Almost surely, 2^21213000330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21213000330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26358696000).

21213000330 is an abundant number, since it is smaller than the sum of its proper divisors (31504391670).

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

21213000330 is a wasteful number, since it uses less digits than its factorization.

21213000330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23479.

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 21213000330 its reverse (3300031212), we get a palindrome (24513031542).

The spelling of 21213000330 in words is "twenty-one billion, two hundred thirteen million, three hundred thirty", and thus it is an aban number.