21224333144 has 24 divisors (see below), whose sum is σ = 46292870340. Its totient is φ = 9096142608.

The previous prime is 21224333113. The next prime is 21224333147. The reversal of 21224333144 is 44133342212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224333147) 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 5 ways as a sum of consecutive naturals, for example, 27071462 + ... + 27072245.

Almost surely, 2^21224333144 is an apocalyptic number.

It is an amenable number.

21224333144 is an abundant number, since it is smaller than the sum of its proper divisors (25068537196).

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

21224333144 is a wasteful number, since it uses less digits than its factorization.

21224333144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54143727 (or 54143716 counting only the distinct ones).

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

Adding to 21224333144 its reverse (44133342212), we get a palindrome (65357675356).

The spelling of 21224333144 in words is "twenty-one billion, two hundred twenty-four million, three hundred thirty-three thousand, one hundred forty-four".