21500524351131 has 16 divisors (see below), whose sum is σ = 32763999193344. Its totient is φ = 12285528132384.

The previous prime is 21500524351091. The next prime is 21500524351183. The reversal of 21500524351131 is 13115342500512.

It is not a de Polignac number, because 21500524351131 - 2¹³ = 21500524342939 is a prime.

It is a super-2 number, since 2×21500524351131² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21500524351092 and 21500524351101.

It is not an unprimeable number, because it can be changed into a prime (21500524351531) 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, 19696840 + ... + 20759733.

It is an arithmetic number, because the mean of its divisors is an integer number (2047749949584).

Almost surely, 2^{21500524351131} is an apocalyptic number.

21500524351131 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21500524351131 is a deficient number, since it is larger than the sum of its proper divisors (11263474842213).

21500524351131 is a wasteful number, since it uses less digits than its factorization.

21500524351131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40481890.

The product of its (nonzero) digits is 18000, while the sum is 33.

Adding to 21500524351131 its reverse (13115342500512), we get a palindrome (34615866851643).

The spelling of 21500524351131 in words is "twenty-one trillion, five hundred billion, five hundred twenty-four million, three hundred fifty-one thousand, one hundred thirty-one".