21213111330 has 64 divisors (see below), whose sum is σ = 56717827200. Its totient is φ = 5641876800.

The previous prime is 21213111329. The next prime is 21213111341. The reversal of 21213111330 is 3311131212.

21213111330 is a `hidden beast` number, since 2 + 1 + 21 + 311 + 1 + 330 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 1321 + ... + 205980.

It is an arithmetic number, because the mean of its divisors is an integer number (886216050).

Almost surely, 2^21213111330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21213111330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28358913600).

21213111330 is an abundant number, since it is smaller than the sum of its proper divisors (35504715870).

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

21213111330 is a wasteful number, since it uses less digits than its factorization.

21213111330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207696 (or 207690 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21213111330 its reverse (3311131212), we get a palindrome (24524242542).

The spelling of 21213111330 in words is "twenty-one billion, two hundred thirteen million, one hundred eleven thousand, three hundred thirty".