21213102330 has 384 divisors, whose sum is σ = 68768593920. Its totient is φ = 4428587520.

The previous prime is 21213102307. The next prime is 21213102359. The reversal of 21213102330 is 3320131212.

21213102330 is a `hidden beast` number, since 2 + 1 + 21 + 310 + 2 + 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 191 ways as a sum of consecutive naturals, for example, 93449677 + ... + 93449903.

It is an arithmetic number, because the mean of its divisors is an integer number (179084880).

Almost surely, 2^21213102330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21213102330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34384296960).

21213102330 is an abundant number, since it is smaller than the sum of its proper divisors (47555491590).

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

21213102330 is a wasteful number, since it uses less digits than its factorization.

21213102330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514 (or 511 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21213102330 its reverse (3320131212), we get a palindrome (24533233542).

The spelling of 21213102330 in words is "twenty-one billion, two hundred thirteen million, one hundred two thousand, three hundred thirty".