21330130 has 16 divisors (see below), whose sum is σ = 39432600. Its totient is φ = 8301312.

The previous prime is 21330119. The next prime is 21330149. The reversal of 21330130 is 3103312.

It can be written as a sum of positive squares in 4 ways, for example, as 20985561 + 344569 = 4581^2 + 587^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21330130.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28455 + ... + 29194.

Almost surely, 2^21330130 is an apocalyptic number.

21330130 is a deficient number, since it is larger than the sum of its proper divisors (18102470).

21330130 is a wasteful number, since it uses less digits than its factorization.

21330130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57693.

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 21330130 is about 4618.4553694931. The cubic root of 21330130 is about 277.3306273749.

Adding to 21330130 its reverse (3103312), we get a palindrome (24433442).

The spelling of 21330130 in words is "twenty-one million, three hundred thirty thousand, one hundred thirty".