21027130 has 32 divisors (see below), whose sum is σ = 40357440. Its totient is φ = 7860480.

The previous prime is 21027109. The next prime is 21027131. The reversal of 21027130 is 3172012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21027131) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 30085 + ... + 30775.

It is an arithmetic number, because the mean of its divisors is an integer number (1261170).

Almost surely, 2^21027130 is an apocalyptic number.

21027130 is a deficient number, since it is larger than the sum of its proper divisors (19330310).

21027130 is a wasteful number, since it uses less digits than its factorization.

21027130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 21027130 is about 4585.5348652038. The cubic root of 21027130 is about 276.0111754209.

Adding to 21027130 its reverse (3172012), we get a palindrome (24199142).

The spelling of 21027130 in words is "twenty-one million, twenty-seven thousand, one hundred thirty".