21134160 has 120 divisors (see below), whose sum is σ = 71814600. Its totient is φ = 5569536.

The previous prime is 21134143. The next prime is 21134173. The reversal of 21134160 is 6143112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3594816 + 17539344 = 1896^2 + 4188^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107182 + ... + 107378.

It is an arithmetic number, because the mean of its divisors is an integer number (598455).

Almost surely, 2^21134160 is an apocalyptic number.

21134160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21134160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35907300).

21134160 is an abundant number, since it is smaller than the sum of its proper divisors (50680440).

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

21134160 is a wasteful number, since it uses less digits than its factorization.

21134160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365 (or 356 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21134160 is about 4597.1904463487. The cubic root of 21134160 is about 276.4786903954.

Adding to 21134160 its reverse (6143112), we get a palindrome (27277272).

The spelling of 21134160 in words is "twenty-one million, one hundred thirty-four thousand, one hundred sixty".