21323013210 has 32 divisors (see below), whose sum is σ = 56861369280. Its totient is φ = 5686136784.

The previous prime is 21323013203. The next prime is 21323013221. The reversal of 21323013210 is 1231032312.

21323013210 is a `hidden beast` number, since 21 + 323 + 0 + 1 + 321 + 0 = 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 15 ways as a sum of consecutive naturals, for example, 39486792 + ... + 39487331.

It is an arithmetic number, because the mean of its divisors is an integer number (1776917790).

Almost surely, 2^21323013210 is an apocalyptic number.

21323013210 is an abundant number, since it is smaller than the sum of its proper divisors (35538356070).

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

21323013210 is a wasteful number, since it uses less digits than its factorization.

21323013210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78974139 (or 78974133 counting only the distinct ones).

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

Adding to 21323013210 its reverse (1231032312), we get a palindrome (22554045522).

The spelling of 21323013210 in words is "twenty-one billion, three hundred twenty-three million, thirteen thousand, two hundred ten".