21231130 has 32 divisors (see below), whose sum is σ = 41057280. Its totient is φ = 7875840.

The previous prime is 21231107. The next prime is 21231143. The reversal of 21231130 is 3113212.

It is a self number, because there is not a number n which added to its sum of digits gives 21231130.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11191 + ... + 12949.

It is an arithmetic number, because the mean of its divisors is an integer number (1283040).

Almost surely, 2^21231130 is an apocalyptic number.

21231130 is a deficient number, since it is larger than the sum of its proper divisors (19826150).

21231130 is a wasteful number, since it uses less digits than its factorization.

21231130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1854.

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

The square root of 21231130 is about 4607.7250351990. The cubic root of 21231130 is about 276.9009016154.

Adding to 21231130 its reverse (3113212), we get a palindrome (24344342).

The spelling of 21231130 in words is "twenty-one million, two hundred thirty-one thousand, one hundred thirty".