21343444308 has 72 divisors (see below), whose sum is σ = 57281357952. Its totient is φ = 6677667072.

The previous prime is 21343444303. The next prime is 21343444351. The reversal of 21343444308 is 80344434312.

21343444308 is a `hidden beast` number, since 2 + 1 + 3 + 4 + 344 + 4 + 308 = 666.

It is a super-2 number, since 2×21343444308² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343444303) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 177091 + ... + 272117.

It is an arithmetic number, because the mean of its divisors is an integer number (795574416).

Almost surely, 2^21343444308 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 21343444308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28640678976).

21343444308 is an abundant number, since it is smaller than the sum of its proper divisors (35937913644).

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

21343444308 is a wasteful number, since it uses less digits than its factorization.

21343444308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95421 (or 95416 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

The spelling of 21343444308 in words is "twenty-one billion, three hundred forty-three million, four hundred forty-four thousand, three hundred eight".