21130320210 has 16 divisors (see below), whose sum is σ = 50712768576. Its totient is φ = 5634752048.

The previous prime is 21130320209. The next prime is 21130320227. The reversal of 21130320210 is 1202303112.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21130320210.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 352171974 + ... + 352172033.

It is an arithmetic number, because the mean of its divisors is an integer number (3169548036).

Almost surely, 2^21130320210 is an apocalyptic number.

21130320210 is an abundant number, since it is smaller than the sum of its proper divisors (29582448366).

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

21130320210 is a wasteful number, since it uses less digits than its factorization.

21130320210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704344017.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21130320210 its reverse (1202303112), we get a palindrome (22332623322).

The spelling of 21130320210 in words is "twenty-one billion, one hundred thirty million, three hundred twenty thousand, two hundred ten".