21168130 has 8 divisors (see below), whose sum is σ = 38102652. Its totient is φ = 8467248.

The previous prime is 21168113. The next prime is 21168137. The reversal of 21168130 is 3186112.

It can be written as a sum of positive squares in 2 ways, for example, as 21132409 + 35721 = 4597^2 + 189^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21168137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1058397 + ... + 1058416.

Almost surely, 2^21168130 is an apocalyptic number.

21168130 is a deficient number, since it is larger than the sum of its proper divisors (16934522).

21168130 is a wasteful number, since it uses less digits than its factorization.

21168130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2116820.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 21168130 is about 4600.8836107861. The cubic root of 21168130 is about 276.6267438080.

The spelling of 21168130 in words is "twenty-one million, one hundred sixty-eight thousand, one hundred thirty".