21544323206 has 32 divisors (see below), whose sum is σ = 37322883840. Its totient is φ = 9136341216.

The previous prime is 21544323179. The next prime is 21544323257. The reversal of 21544323206 is 60232344512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 501965 + ... + 543191.

It is an arithmetic number, because the mean of its divisors is an integer number (1166340120).

Almost surely, 2^21544323206 is an apocalyptic number.

21544323206 is a deficient number, since it is larger than the sum of its proper divisors (15778560634).

21544323206 is a wasteful number, since it uses less digits than its factorization.

21544323206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41628.

The product of its (nonzero) digits is 34560, while the sum is 32.

Adding to 21544323206 its reverse (60232344512), we get a palindrome (81776667718).

The spelling of 21544323206 in words is "twenty-one billion, five hundred forty-four million, three hundred twenty-three thousand, two hundred six".