21500444244341 has 32 divisors (see below), whose sum is σ = 24149629702656. Its totient is φ = 19035681280000.

The previous prime is 21500444244319. The next prime is 21500444244347. The reversal of 21500444244341 is 14344244400512.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21500444244341 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21500444244295 and 21500444244304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21500444244347) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10166471 + ... + 12097851.

It is an arithmetic number, because the mean of its divisors is an integer number (754675928208).

Almost surely, 2^{21500444244341} is an apocalyptic number.

It is an amenable number.

21500444244341 is a deficient number, since it is larger than the sum of its proper divisors (2649185458315).

21500444244341 is a wasteful number, since it uses less digits than its factorization.

21500444244341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1931893.

The product of its (nonzero) digits is 245760, while the sum is 38.

Adding to 21500444244341 its reverse (14344244400512), we get a palindrome (35844688644853).

The spelling of 21500444244341 in words is "twenty-one trillion, five hundred billion, four hundred forty-four million, two hundred forty-four thousand, three hundred forty-one".