21423230312344 has 128 divisors (see below), whose sum is σ = 48208757760000. Its totient is φ = 8731151170560.

The previous prime is 21423230312339. The next prime is 21423230312359. The reversal of 21423230312344 is 44321303232412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52268929 + ... + 52677199.

It is an arithmetic number, because the mean of its divisors is an integer number (376630920000).

Almost surely, 2^{21423230312344} 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 21423230312344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24104378880000).

21423230312344 is an abundant number, since it is smaller than the sum of its proper divisors (26785527447656).

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

21423230312344 is a wasteful number, since it uses less digits than its factorization.

21423230312344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408801 (or 408797 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 34.

Adding to 21423230312344 its reverse (44321303232412), we get a palindrome (65744533544756).

The spelling of 21423230312344 in words is "twenty-one trillion, four hundred twenty-three billion, two hundred thirty million, three hundred twelve thousand, three hundred forty-four".