21440157363305 has 4 divisors (see below), whose sum is σ = 25728188835972. Its totient is φ = 17152125890640.

The previous prime is 21440157363269. The next prime is 21440157363319. The reversal of 21440157363305 is 50336375104412.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13488952998361 + 7951204364944 = 3672731^2 + 2819788^2 .

It is not a de Polignac number, because 21440157363305 - 2¹⁴ = 21440157346921 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2144015736326 + ... + 2144015736335.

It is an arithmetic number, because the mean of its divisors is an integer number (6432047208993).

Almost surely, 2^{21440157363305} is an apocalyptic number.

It is an amenable number.

21440157363305 is a deficient number, since it is larger than the sum of its proper divisors (4288031472667).

21440157363305 is an equidigital number, since it uses as much as digits as its factorization.

21440157363305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4288031472666.

The product of its (nonzero) digits is 907200, while the sum is 44.

The spelling of 21440157363305 in words is "twenty-one trillion, four hundred forty billion, one hundred fifty-seven million, three hundred sixty-three thousand, three hundred five".