21440110650559 has 4 divisors (see below), whose sum is σ = 21504884399080. Its totient is φ = 21375336902040.

The previous prime is 21440110650503. The next prime is 21440110650571. The reversal of 21440110650559 is 95505601104412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21440110650559 - 2¹³ = 21440110642367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21440110654559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32386873764 + ... + 32386874425.

It is an arithmetic number, because the mean of its divisors is an integer number (5376221099770).

Almost surely, 2^{21440110650559} is an apocalyptic number.

21440110650559 is a deficient number, since it is larger than the sum of its proper divisors (64773748521).

21440110650559 is an equidigital number, since it uses as much as digits as its factorization.

21440110650559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64773748520.

The product of its (nonzero) digits is 216000, while the sum is 43.

The spelling of 21440110650559 in words is "twenty-one trillion, four hundred forty billion, one hundred ten million, six hundred fifty thousand, five hundred fifty-nine".