21224210144 has 12 divisors (see below), whose sum is σ = 41785163784. Its totient is φ = 10612105056.

The previous prime is 21224210143. The next prime is 21224210153. The reversal of 21224210144 is 44101242212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224210143) by changing a digit.

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 as a sum of consecutive naturals, namely, 331628252 + ... + 331628315.

It is an arithmetic number, because the mean of its divisors is an integer number (3482096982).

Almost surely, 2^21224210144 is an apocalyptic number.

It is an amenable number.

21224210144 is a deficient number, since it is larger than the sum of its proper divisors (20560953640).

21224210144 is an equidigital number, since it uses as much as digits as its factorization.

21224210144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663256577 (or 663256569 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21224210144 its reverse (44101242212), we get a palindrome (65325452356).

The spelling of 21224210144 in words is "twenty-one billion, two hundred twenty-four million, two hundred ten thousand, one hundred forty-four".