21320111310 has 16 divisors (see below), whose sum is σ = 51168267216. Its totient is φ = 5685363008.

The previous prime is 21320111291. The next prime is 21320111363. The reversal of 21320111310 is 1311102312.

It is a happy number.

It is a super-2 number, since 2×21320111310² (a number of 21 digits) contains 22 as substring.

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 21320111310.

It is a congruent number.

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, 355335159 + ... + 355335218.

It is an arithmetic number, because the mean of its divisors is an integer number (3198016701).

Almost surely, 2^21320111310 is an apocalyptic number.

21320111310 is an abundant number, since it is smaller than the sum of its proper divisors (29848155906).

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

21320111310 is a wasteful number, since it uses less digits than its factorization.

21320111310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710670387.

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

Adding to 21320111310 its reverse (1311102312), we get a palindrome (22631213622).

The spelling of 21320111310 in words is "twenty-one billion, three hundred twenty million, one hundred eleven thousand, three hundred ten".