21224550242144 has 12 divisors (see below), whose sum is σ = 41785833289284. Its totient is φ = 10612275121056.

The previous prime is 21224550242113. The next prime is 21224550242153. The reversal of 21224550242144 is 44124205542212.

It is a junction number, because it is equal to n+sod(n) for n = 21224550242098 and 21224550242107.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331633597502 + ... + 331633597565.

It is an arithmetic number, because the mean of its divisors is an integer number (3482152774107).

Almost surely, 2^{21224550242144} is an apocalyptic number.

It is an amenable number.

21224550242144 is a deficient number, since it is larger than the sum of its proper divisors (20561283047140).

21224550242144 is an equidigital number, since it uses as much as digits as its factorization.

21224550242144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663267195077 (or 663267195069 counting only the distinct ones).

The product of its (nonzero) digits is 204800, while the sum is 38.

Adding to 21224550242144 its reverse (44124205542212), we get a palindrome (65348755784356).

The spelling of 21224550242144 in words is "twenty-one trillion, two hundred twenty-four billion, five hundred fifty million, two hundred forty-two thousand, one hundred forty-four".