21344223220240 has 20 divisors (see below), whose sum is σ = 49625318987244. Its totient is φ = 8537689288064.

The previous prime is 21344223220237. The next prime is 21344223220249. The reversal of 21344223220240 is 4202232244312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11989654161664 + 9354569058576 = 3462608^2 + 3058524^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (21344223220249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133401395047 + ... + 133401395206.

Almost surely, 2^{21344223220240} is an apocalyptic number.

21344223220240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21344223220240 is an abundant number, since it is smaller than the sum of its proper divisors (28281095767004).

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

21344223220240 is a wasteful number, since it uses less digits than its factorization.

21344223220240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266802790266 (or 266802790260 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 31.

Adding to 21344223220240 its reverse (4202232244312), we get a palindrome (25546455464552).

The spelling of 21344223220240 in words is "twenty-one trillion, three hundred forty-four billion, two hundred twenty-three million, two hundred twenty thousand, two hundred forty".