21323130210 has 96 divisors (see below), whose sum is σ = 57458419200. Its totient is φ = 5480640000.

The previous prime is 21323130197. The next prime is 21323130211. The reversal of 21323130210 is 1203132312.

21323130210 is a `hidden beast` number, since 2 + 1 + 323 + 130 + 210 = 666.

It is a super-2 number, since 2×21323130210² (a number of 21 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (21323130211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 685066 + ... + 715514.

It is an arithmetic number, because the mean of its divisors is an integer number (598525200).

Almost surely, 2^21323130210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21323130210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28729209600).

21323130210 is an abundant number, since it is smaller than the sum of its proper divisors (36135288990).

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

21323130210 is a wasteful number, since it uses less digits than its factorization.

21323130210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30744 (or 30741 counting only the distinct ones).

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

Adding to 21323130210 its reverse (1203132312), we get a palindrome (22526262522).

The spelling of 21323130210 in words is "twenty-one billion, three hundred twenty-three million, one hundred thirty thousand, two hundred ten".