21343223104 has 112 divisors (see below), whose sum is σ = 51370260480. Its totient is φ = 8588943360.

The previous prime is 21343223093. The next prime is 21343223137. The reversal of 21343223104 is 40132234312.

It is a tau number, because it is divible by the number of its divisors (112).

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 15 ways as a sum of consecutive naturals, for example, 3507937 + ... + 3514015.

It is an arithmetic number, because the mean of its divisors is an integer number (458663040).

Almost surely, 2^21343223104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21343223104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25685130240).

21343223104 is an abundant number, since it is smaller than the sum of its proper divisors (30027037376).

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

21343223104 is a wasteful number, since it uses less digits than its factorization.

21343223104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6576 (or 6566 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21343223104 its reverse (40132234312), we get a palindrome (61475457416).

The spelling of 21343223104 in words is "twenty-one billion, three hundred forty-three million, two hundred twenty-three thousand, one hundred four".