21144041131 has 4 divisors (see below), whose sum is σ = 21180062232. Its totient is φ = 21108020032.

The previous prime is 21144041099. The next prime is 21144041173. The reversal of 21144041131 is 13114044112.

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 21144041131 - 2⁵ = 21144041099 is a prime.

It is a super-2 number, since 2×21144041131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21144041731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18009670 + ... + 18010843.

It is an arithmetic number, because the mean of its divisors is an integer number (5295015558).

Almost surely, 2^21144041131 is an apocalyptic number.

21144041131 is a deficient number, since it is larger than the sum of its proper divisors (36021101).

21144041131 is an equidigital number, since it uses as much as digits as its factorization.

21144041131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36021100.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 21144041131 its reverse (13114044112), we get a palindrome (34258085243).

The spelling of 21144041131 in words is "twenty-one billion, one hundred forty-four million, forty-one thousand, one hundred thirty-one".