21330310 has 8 divisors (see below), whose sum is σ = 38394576. Its totient is φ = 8532120.

The previous prime is 21330299. The next prime is 21330311. The reversal of 21330310 is 1303312.

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

It is a super-2 number, since 2×21330310² = 909964249392200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330311) 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, 1066506 + ... + 1066525.

It is an arithmetic number, because the mean of its divisors is an integer number (4799322).

Almost surely, 2^21330310 is an apocalyptic number.

21330310 is a deficient number, since it is larger than the sum of its proper divisors (17064266).

21330310 is a wasteful number, since it uses less digits than its factorization.

21330310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2133038.

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

The square root of 21330310 is about 4618.4748564867. The cubic root of 21330310 is about 277.3314074822.

Adding to 21330310 its reverse (1303312), we get a palindrome (22633622).

The spelling of 21330310 in words is "twenty-one million, three hundred thirty thousand, three hundred ten".