21727375745 has 8 divisors (see below), whose sum is σ = 26074901160. Its totient is φ = 17380533760.

The previous prime is 21727375717. The next prime is 21727375751. The reversal of 21727375745 is 54757372712.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8078594161 + 13648781584 = 89881^2 + 116828^2 .

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

It is not a de Polignac number, because 21727375745 - 2²⁰ = 21726327169 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21727375693 and 21727375702.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98096 + ... + 230385.

It is an arithmetic number, because the mean of its divisors is an integer number (3259362645).

Almost surely, 2^21727375745 is an apocalyptic number.

It is an amenable number.

21727375745 is a deficient number, since it is larger than the sum of its proper divisors (4347525415).

21727375745 is a wasteful number, since it uses less digits than its factorization.

21727375745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341715.

The product of its digits is 2881200, while the sum is 50.

The spelling of 21727375745 in words is "twenty-one billion, seven hundred twenty-seven million, three hundred seventy-five thousand, seven hundred forty-five".