21375265117 has 8 divisors (see below), whose sum is σ = 21891424824. Its totient is φ = 20863285248.

The previous prime is 21375265081. The next prime is 21375265133. The reversal of 21375265117 is 71156257312.

It can be written as a sum of positive squares in 4 ways, for example, as 1023104196 + 20352160921 = 31986^2 + 142661^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21375265117 - 2¹⁵ = 21375232349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21375265117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21375265147) by changing a digit.

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, 1034608 + ... + 1055065.

It is an arithmetic number, because the mean of its divisors is an integer number (2736428103).

Almost surely, 2^21375265117 is an apocalyptic number.

It is an amenable number.

21375265117 is a deficient number, since it is larger than the sum of its proper divisors (516159707).

21375265117 is a wasteful number, since it uses less digits than its factorization.

21375265117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2089919.

The product of its digits is 88200, while the sum is 40.

The spelling of 21375265117 in words is "twenty-one billion, three hundred seventy-five million, two hundred sixty-five thousand, one hundred seventeen".