21155131134 has 24 divisors (see below), whose sum is σ = 46388363112. Its totient is φ = 6966749520.

The previous prime is 21155131121. The next prime is 21155131171. The reversal of 21155131134 is 43113155112.

21155131134 is a `hidden beast` number, since 2 + 1 + 15 + 513 + 1 + 134 = 666.

It is a super-2 number, since 2×21155131134² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21155131098 and 21155131107.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 7078537 + ... + 7081524.

It is an arithmetic number, because the mean of its divisors is an integer number (1932848463).

Almost surely, 2^21155131134 is an apocalyptic number.

21155131134 is an abundant number, since it is smaller than the sum of its proper divisors (25233231978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21155131134 is a wasteful number, since it uses less digits than its factorization.

21155131134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14160152 (or 14160149 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

Adding to 21155131134 its reverse (43113155112), we get a palindrome (64268286246).

The spelling of 21155131134 in words is "twenty-one billion, one hundred fifty-five million, one hundred thirty-one thousand, one hundred thirty-four".