21544141551131 has 4 divisors (see below), whose sum is σ = 22239113859264. Its totient is φ = 20849169243000.

The previous prime is 21544141551109. The next prime is 21544141551169. The reversal of 21544141551131 is 13115514144512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21544141551131 - 2²² = 21544137356827 is a prime.

It is a super-2 number, since 2×21544141551131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21544141551431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347486154020 + ... + 347486154081.

It is an arithmetic number, because the mean of its divisors is an integer number (5559778464816).

Almost surely, 2^{21544141551131} is an apocalyptic number.

21544141551131 is a deficient number, since it is larger than the sum of its proper divisors (694972308133).

21544141551131 is an equidigital number, since it uses as much as digits as its factorization.

21544141551131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694972308132.

The product of its digits is 48000, while the sum is 38.

Adding to 21544141551131 its reverse (13115514144512), we get a palindrome (34659655695643).

The spelling of 21544141551131 in words is "twenty-one trillion, five hundred forty-four billion, one hundred forty-one million, five hundred fifty-one thousand, one hundred thirty-one".