21375065040605 has 8 divisors (see below), whose sum is σ = 26070571131864. Its totient is φ = 16819723310400.

The previous prime is 21375065040541. The next prime is 21375065040653. The reversal of 21375065040605 is 50604056057312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 41409808036 + 21333655232569 = 203494^2 + 4618837^2 .

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

It is not a de Polignac number, because 21375065040605 - 2⁶ = 21375065040541 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 7 ways as a sum of consecutive naturals, for example, 35041089926 + ... + 35041090535.

It is an arithmetic number, because the mean of its divisors is an integer number (3258821391483).

Almost surely, 2^{21375065040605} is an apocalyptic number.

It is an amenable number.

21375065040605 is a deficient number, since it is larger than the sum of its proper divisors (4695506091259).

21375065040605 is an equidigital number, since it uses as much as digits as its factorization.

21375065040605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70082180527.

The product of its (nonzero) digits is 756000, while the sum is 44.

The spelling of 21375065040605 in words is "twenty-one trillion, three hundred seventy-five billion, sixty-five million, forty thousand, six hundred five".