21134441131 has 4 divisors (see below), whose sum is σ = 21170081592. Its totient is φ = 21098800672.

The previous prime is 21134441129. The next prime is 21134441149. The reversal of 21134441131 is 13114443112.

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 21134441131 - 2¹ = 21134441129 is a prime.

It is a super-2 number, since 2×21134441131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21134441096 and 21134441105.

It is not an unprimeable number, because it can be changed into a prime (21134441161) 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, 17819341 + ... + 17820526.

It is an arithmetic number, because the mean of its divisors is an integer number (5292520398).

Almost surely, 2^21134441131 is an apocalyptic number.

21134441131 is a deficient number, since it is larger than the sum of its proper divisors (35640461).

21134441131 is an equidigital number, since it uses as much as digits as its factorization.

21134441131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35640460.

The product of its digits is 1152, while the sum is 25.

Adding to 21134441131 its reverse (13114443112), we get a palindrome (34248884243).

The spelling of 21134441131 in words is "twenty-one billion, one hundred thirty-four million, four hundred forty-one thousand, one hundred thirty-one".