21030160 has 20 divisors (see below), whose sum is σ = 48895308. Its totient is φ = 8412032.

The previous prime is 21030127. The next prime is 21030181. The reversal of 21030160 is 6103012.

It can be written as a sum of positive squares in 2 ways, for example, as 3154176 + 17875984 = 1776^2 + 4228^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 21030160.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131359 + ... + 131518.

Almost surely, 2^21030160 is an apocalyptic number.

21030160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21030160 is an abundant number, since it is smaller than the sum of its proper divisors (27865148).

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

21030160 is a wasteful number, since it uses less digits than its factorization.

21030160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262890 (or 262884 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21030160 is about 4585.8652400610. The cubic root of 21030160 is about 276.0244324797.

Adding to 21030160 its reverse (6103012), we get a palindrome (27133172).

The spelling of 21030160 in words is "twenty-one million, thirty thousand, one hundred sixty".