21130311210 has 32 divisors (see below), whose sum is σ = 50761166400. Its totient is φ = 5629369728.

The previous prime is 21130311113. The next prime is 21130311227. The reversal of 21130311210 is 1211303112.

It is a happy number.

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 21130311210.

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, 304252 + ... + 367191.

It is an arithmetic number, because the mean of its divisors is an integer number (1586286450).

Almost surely, 2^21130311210 is an apocalyptic number.

21130311210 is an abundant number, since it is smaller than the sum of its proper divisors (29630855190).

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

21130311210 is a wasteful number, since it uses less digits than its factorization.

21130311210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672502.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21130311210 its reverse (1211303112), we get a palindrome (22341614322).

The spelling of 21130311210 in words is "twenty-one billion, one hundred thirty million, three hundred eleven thousand, two hundred ten".