21310320312 has 24 divisors (see below), whose sum is σ = 57715451040. Its totient is φ = 7103440080.

The previous prime is 21310320287. The next prime is 21310320349. The reversal of 21310320312 is 21302301312.

21310320312 is a `hidden beast` number, since 2 + 1 + 31 + 0 + 320 + 312 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

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

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 5 ways as a sum of consecutive naturals, for example, 147988264 + ... + 147988407.

It is an arithmetic number, because the mean of its divisors is an integer number (2404810460).

Almost surely, 2^21310320312 is an apocalyptic number.

It is an amenable number.

21310320312 is an abundant number, since it is smaller than the sum of its proper divisors (36405130728).

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

21310320312 is a wasteful number, since it uses less digits than its factorization.

21310320312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295976683 (or 295976676 counting only the distinct ones).

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

Adding to 21310320312 its reverse (21302301312), we get a palindrome (42612621624).

The spelling of 21310320312 in words is "twenty-one billion, three hundred ten million, three hundred twenty thousand, three hundred twelve".