21320244312 has 64 divisors (see below), whose sum is σ = 55991520000. Its totient is φ = 6752110464.

The previous prime is 21320244263. The next prime is 21320244317. The reversal of 21320244312 is 21344202312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320244317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47362 + ... + 211857.

It is an arithmetic number, because the mean of its divisors is an integer number (874867500).

Almost surely, 2^21320244312 is an apocalyptic number.

It is an amenable number.

21320244312 is an abundant number, since it is smaller than the sum of its proper divisors (34671275688).

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

21320244312 is a wasteful number, since it uses less digits than its factorization.

21320244312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259400 (or 259396 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21320244312 its reverse (21344202312), we get a palindrome (42664446624).

The spelling of 21320244312 in words is "twenty-one billion, three hundred twenty million, two hundred forty-four thousand, three hundred twelve".