21745159365 has 16 divisors (see below), whose sum is σ = 34794226368. Its totient is φ = 11596761216.

The previous prime is 21745159363. The next prime is 21745159409. The reversal of 21745159365 is 56395154712.

It is not a de Polignac number, because 21745159365 - 2¹ = 21745159363 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21745159361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 356862 + ... + 413328.

It is an arithmetic number, because the mean of its divisors is an integer number (2174639148).

Almost surely, 2^21745159365 is an apocalyptic number.

It is an amenable number.

21745159365 is a deficient number, since it is larger than the sum of its proper divisors (13049067003).

21745159365 is a wasteful number, since it uses less digits than its factorization.

21745159365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82148.

The product of its digits is 1134000, while the sum is 48.

The spelling of 21745159365 in words is "twenty-one billion, seven hundred forty-five million, one hundred fifty-nine thousand, three hundred sixty-five".