21130130 has 32 divisors (see below), whose sum is σ = 44029440. Its totient is φ = 7151040.

The previous prime is 21130111. The next prime is 21130231. The reversal of 21130130 is 3103112.

It is a Curzon 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 15 ways as a sum of consecutive naturals, for example, 3620 + ... + 7440.

It is an arithmetic number, because the mean of its divisors is an integer number (1375920).

Almost surely, 2^21130130 is an apocalyptic number.

21130130 is an abundant number, since it is smaller than the sum of its proper divisors (22899310).

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

21130130 is a wasteful number, since it uses less digits than its factorization.

21130130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3914.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 21130130 is about 4596.7521142650. The cubic root of 21130130 is about 276.4611156893.

Adding to 21130130 its reverse (3103112), we get a palindrome (24233242).

The spelling of 21130130 in words is "twenty-one million, one hundred thirty thousand, one hundred thirty".