21303216312 has 32 divisors (see below), whose sum is σ = 60866332800. Its totient is φ = 6086633184.

The previous prime is 21303216301. The next prime is 21303216323. The reversal of 21303216312 is 21361230312.

It is an interprime number because it is at equal distance from previous prime (21303216301) and next prime (21303216323).

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

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 63402262 + ... + 63402597.

It is an arithmetic number, because the mean of its divisors is an integer number (1902072900).

Almost surely, 2^21303216312 is an apocalyptic number.

It is an amenable number.

21303216312 is an abundant number, since it is smaller than the sum of its proper divisors (39563116488).

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

21303216312 is a wasteful number, since it uses less digits than its factorization.

21303216312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126804875 (or 126804871 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 21303216312 its reverse (21361230312), we get a palindrome (42664446624).

The spelling of 21303216312 in words is "twenty-one billion, three hundred three million, two hundred sixteen thousand, three hundred twelve".