21445610345 has 8 divisors (see below), whose sum is σ = 26622137160. Its totient is φ = 16564885120.

The previous prime is 21445610317. The next prime is 21445610353. The reversal of 21445610345 is 54301654412.

It can be written as a sum of positive squares in 4 ways, for example, as 7975918864 + 13469691481 = 89308^2 + 116059^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21445610345 - 2⁸ = 21445610089 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73950236 + ... + 73950525.

It is an arithmetic number, because the mean of its divisors is an integer number (3327767145).

Almost surely, 2^21445610345 is an apocalyptic number.

It is an amenable number.

21445610345 is a deficient number, since it is larger than the sum of its proper divisors (5176526815).

21445610345 is a wasteful number, since it uses less digits than its factorization.

21445610345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147900795.

The product of its (nonzero) digits is 57600, while the sum is 35.

The spelling of 21445610345 in words is "twenty-one billion, four hundred forty-five million, six hundred ten thousand, three hundred forty-five".