21445160365 has 4 divisors (see below), whose sum is σ = 25734192444. Its totient is φ = 17156128288.

The previous prime is 21445160339. The next prime is 21445160389. The reversal of 21445160365 is 56306154412.

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 15220897129 + 6224263236 = 123373^2 + 78894^2 .

It is a cyclic number.

It is not a de Polignac number, because 21445160365 - 2⁵ = 21445160333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2144516032 + ... + 2144516041.

It is an arithmetic number, because the mean of its divisors is an integer number (6433548111).

Almost surely, 2^21445160365 is an apocalyptic number.

It is an amenable number.

21445160365 is a deficient number, since it is larger than the sum of its proper divisors (4289032079).

21445160365 is an equidigital number, since it uses as much as digits as its factorization.

21445160365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4289032078.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 21445160365 in words is "twenty-one billion, four hundred forty-five million, one hundred sixty thousand, three hundred sixty-five".