21375175171731 has 16 divisors (see below), whose sum is σ = 29163266204160. Its totient is φ = 13918605835680.

The previous prime is 21375175171729. The next prime is 21375175171769. The reversal of 21375175171731 is 13717157157312.

It is not a de Polignac number, because 21375175171731 - 2¹ = 21375175171729 is a prime.

It is a super-3 number, since 3×21375175171731³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (21375175171781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17113750 + ... + 18320228.

It is an arithmetic number, because the mean of its divisors is an integer number (1822704137760).

Almost surely, 2^{21375175171731} is an apocalyptic number.

21375175171731 is a deficient number, since it is larger than the sum of its proper divisors (7788091032429).

21375175171731 is a wasteful number, since it uses less digits than its factorization.

21375175171731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343866.

The product of its digits is 1080450, while the sum is 51.

The spelling of 21375175171731 in words is "twenty-one trillion, three hundred seventy-five billion, one hundred seventy-five million, one hundred seventy-one thousand, seven hundred thirty-one".