21753537237471 has 32 divisors (see below), whose sum is σ = 31264713768960. Its totient is φ = 13374423558144.

The previous prime is 21753537237431. The next prime is 21753537237511. The reversal of 21753537237471 is 17473273535712.

It is an interprime number because it is at equal distance from previous prime (21753537237431) and next prime (21753537237511).

It is not a de Polignac number, because 21753537237471 - 2¹⁰ = 21753537236447 is a prime.

It is a super-3 number, since 3×21753537237471³ (a number of 41 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21753537237431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 658722466 + ... + 658755488.

It is an arithmetic number, because the mean of its divisors is an integer number (977022305280).

Almost surely, 2^{21753537237471} is an apocalyptic number.

21753537237471 is a deficient number, since it is larger than the sum of its proper divisors (9511176531489).

21753537237471 is a wasteful number, since it uses less digits than its factorization.

21753537237471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48135.

The product of its digits is 25930800, while the sum is 57.

The spelling of 21753537237471 in words is "twenty-one trillion, seven hundred fifty-three billion, five hundred thirty-seven million, two hundred thirty-seven thousand, four hundred seventy-one".