21144003340 has 24 divisors (see below), whose sum is σ = 44407465200. Its totient is φ = 8456637888.

The previous prime is 21144003227. The next prime is 21144003347. The reversal of 21144003340 is 4330044112.

It is not an unprimeable number, because it can be changed into a prime (21144003347) 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 7 ways as a sum of consecutive naturals, for example, 135211 + ... + 246109.

It is an arithmetic number, because the mean of its divisors is an integer number (1850311050).

Almost surely, 2^21144003340 is an apocalyptic number.

21144003340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21144003340 is an abundant number, since it is smaller than the sum of its proper divisors (23263461860).

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

21144003340 is a wasteful number, since it uses less digits than its factorization.

21144003340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120441 (or 120439 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21144003340 its reverse (4330044112), we get a palindrome (25474047452).

The spelling of 21144003340 in words is "twenty-one billion, one hundred forty-four million, three thousand, three hundred forty".