21344320412 has 24 divisors (see below), whose sum is σ = 37973975760. Its totient is φ = 10494696960.

The previous prime is 21344320399. The next prime is 21344320433. The reversal of 21344320412 is 21402344312.

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, 1402508 + ... + 1417644.

It is an arithmetic number, because the mean of its divisors is an integer number (1582248990).

Almost surely, 2^21344320412 is an apocalyptic number.

It is an amenable number.

21344320412 is a deficient number, since it is larger than the sum of its proper divisors (16629655348).

21344320412 is a wasteful number, since it uses less digits than its factorization.

21344320412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20981 (or 20979 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21344320412 its reverse (21402344312), we get a palindrome (42746664724).

The spelling of 21344320412 in words is "twenty-one billion, three hundred forty-four million, three hundred twenty thousand, four hundred twelve".