21423344310 has 96 divisors (see below), whose sum is σ = 56532722688. Its totient is φ = 5627750400.

The previous prime is 21423344309. The next prime is 21423344347. The reversal of 21423344310 is 1344332412.

21423344310 is a `hidden beast` number, since 2 + 1 + 4 + 2 + 3 + 344 + 310 = 666.

It is a super-2 number, since 2×21423344310² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7560654 + ... + 7563486.

It is an arithmetic number, because the mean of its divisors is an integer number (588882528).

Almost surely, 2^21423344310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21423344310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28266361344).

21423344310 is an abundant number, since it is smaller than the sum of its proper divisors (35109378378).

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

21423344310 is a wasteful number, since it uses less digits than its factorization.

21423344310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4070 (or 4067 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21423344310 its reverse (1344332412), we get a palindrome (22767676722).

The spelling of 21423344310 in words is "twenty-one billion, four hundred twenty-three million, three hundred forty-four thousand, three hundred ten".