21343130 has 16 divisors (see below), whose sum is σ = 39742920. Its totient is φ = 8242752.

The previous prime is 21343129. The next prime is 21343139. The reversal of 21343130 is 3134312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 19035769 + 2307361 = 4363^2 + 1519^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21343099 and 21343108.

It is not an unprimeable number, because it can be changed into a prime (21343139) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 36509 + ... + 37088.

Almost surely, 2^21343130 is an apocalyptic number.

21343130 is a deficient number, since it is larger than the sum of its proper divisors (18399790).

21343130 is a wasteful number, since it uses less digits than its factorization.

21343130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73633.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 21343130 is about 4619.8625520680. The cubic root of 21343130 is about 277.3869571764.

Adding to 21343130 its reverse (3134312), we get a palindrome (24477442).

The spelling of 21343130 in words is "twenty-one million, three hundred forty-three thousand, one hundred thirty".