21551542324244 has 12 divisors (see below), whose sum is σ = 39700209544800. Its totient is φ = 10208625311448.

The previous prime is 21551542324241. The next prime is 21551542324267. The reversal of 21551542324244 is 44242324515512.

It is a junction number, because it is equal to n+sod(n) for n = 21551542324195 and 21551542324204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21551542324241) 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 in 3 ways as a sum of consecutive naturals, for example, 141786462584 + ... + 141786462735.

It is an arithmetic number, because the mean of its divisors is an integer number (3308350795400).

Almost surely, 2^{21551542324244} is an apocalyptic number.

It is an amenable number.

21551542324244 is a deficient number, since it is larger than the sum of its proper divisors (18148667220556).

21551542324244 is a wasteful number, since it uses less digits than its factorization.

21551542324244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283572925342 (or 283572925340 counting only the distinct ones).

The product of its digits is 1536000, while the sum is 44.

Adding to 21551542324244 its reverse (44242324515512), we get a palindrome (65793866839756).

The spelling of 21551542324244 in words is "twenty-one trillion, five hundred fifty-one billion, five hundred forty-two million, three hundred twenty-four thousand, two hundred forty-four".