21312313340 has 48 divisors (see below), whose sum is σ = 45115812000. Its totient is φ = 8456516352.

The previous prime is 21312313339. The next prime is 21312313369. The reversal of 21312313340 is 4331321312.

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 15 ways as a sum of consecutive naturals, for example, 2466107 + ... + 2474733.

It is an arithmetic number, because the mean of its divisors is an integer number (939912750).

Almost surely, 2^21312313340 is an apocalyptic number.

21312313340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21312313340 is an abundant number, since it is smaller than the sum of its proper divisors (23803498660).

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

21312313340 is a wasteful number, since it uses less digits than its factorization.

21312313340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9614 (or 9612 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21312313340 its reverse (4331321312), we get a palindrome (25643634652).

The spelling of 21312313340 in words is "twenty-one billion, three hundred twelve million, three hundred thirteen thousand, three hundred forty".