21444313340 has 12 divisors (see below), whose sum is σ = 45033058056. Its totient is φ = 8577725328.

The previous prime is 21444313337. The next prime is 21444313361. The reversal of 21444313340 is 4331344412.

It is a happy number.

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 3 ways as a sum of consecutive naturals, for example, 536107814 + ... + 536107853.

It is an arithmetic number, because the mean of its divisors is an integer number (3752754838).

Almost surely, 2^21444313340 is an apocalyptic number.

21444313340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21444313340 is an abundant number, since it is smaller than the sum of its proper divisors (23588744716).

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

21444313340 is a wasteful number, since it uses less digits than its factorization.

21444313340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072215676 (or 1072215674 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 21444313340 its reverse (4331344412), we get a palindrome (25775657752).

The spelling of 21444313340 in words is "twenty-one billion, four hundred forty-four million, three hundred thirteen thousand, three hundred forty".