21361330 has 8 divisors (see below), whose sum is σ = 38450412. Its totient is φ = 8544528.

The previous prime is 21361303. The next prime is 21361391. The reversal of 21361330 is 3316312.

It can be written as a sum of positive squares in 2 ways, for example, as 20985561 + 375769 = 4581^2 + 613^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21361298 and 21361307.

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 3 ways as a sum of consecutive naturals, for example, 1068057 + ... + 1068076.

Almost surely, 2^21361330 is an apocalyptic number.

21361330 is a deficient number, since it is larger than the sum of its proper divisors (17089082).

21361330 is a wasteful number, since it uses less digits than its factorization.

21361330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136140.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 21361330 is about 4621.8318878990. The cubic root of 21361330 is about 277.4657804841.

Adding to 21361330 its reverse (3316312), we get a palindrome (24677642).

The spelling of 21361330 in words is "twenty-one million, three hundred sixty-one thousand, three hundred thirty".