21321130 has 8 divisors (see below), whose sum is σ = 38378052. Its totient is φ = 8528448.

The previous prime is 21321121. The next prime is 21321133. The reversal of 21321130 is 3112312.

It can be written as a sum of positive squares in 2 ways, for example, as 17065161 + 4255969 = 4131^2 + 2063^2 .

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

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 21321130.

It is not an unprimeable number, because it can be changed into a prime (21321133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1066047 + ... + 1066066.

Almost surely, 2^21321130 is an apocalyptic number.

21321130 is a deficient number, since it is larger than the sum of its proper divisors (17056922).

21321130 is a wasteful number, since it uses less digits than its factorization.

21321130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2132120.

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

The square root of 21321130 is about 4617.4809149579. The cubic root of 21321130 is about 277.2916164112.

Adding to 21321130 its reverse (3112312), we get a palindrome (24433442).

The spelling of 21321130 in words is "twenty-one million, three hundred twenty-one thousand, one hundred thirty".