21333130 has 96 divisors (see below), whose sum is σ = 51193296. Its totient is φ = 6322176.

The previous prime is 21333107. The next prime is 21333133. The reversal of 21333130 is 3133312.

It can be written as a sum of positive squares in 8 ways, for example, as 14876449 + 6456681 = 3857^2 + 2541^2 .

It is not an unprimeable number, because it can be changed into a prime (21333133) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 108192 + ... + 108388.

Almost surely, 2^21333130 is an apocalyptic number.

21333130 is an abundant number, since it is smaller than the sum of its proper divisors (29860166).

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

21333130 is a wasteful number, since it uses less digits than its factorization.

21333130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 16.

The square root of 21333130 is about 4618.7801419855. The cubic root of 21333130 is about 277.3436285908.

Adding to 21333130 its reverse (3133312), we get a palindrome (24466442).

The spelling of 21333130 in words is "twenty-one million, three hundred thirty-three thousand, one hundred thirty".