21230313 has 8 divisors (see below), whose sum is σ = 30484608. Its totient is φ = 13064784.

The previous prime is 21230309. The next prime is 21230329. The reversal of 21230313 is 31303212.

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

It is not a de Polignac number, because 21230313 - 2² = 21230309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21230292 and 21230301.

It is not an unprimeable number, because it can be changed into a prime (21230303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272145 + ... + 272222.

It is an arithmetic number, because the mean of its divisors is an integer number (3810576).

Almost surely, 2^21230313 is an apocalyptic number.

It is an amenable number.

21230313 is a deficient number, since it is larger than the sum of its proper divisors (9254295).

21230313 is a wasteful number, since it uses less digits than its factorization.

21230313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544383.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 21230313 is about 4607.6363788823. The cubic root of 21230313 is about 276.8973497407.

Adding to 21230313 its reverse (31303212), we get a palindrome (52533525).

The spelling of 21230313 in words is "twenty-one million, two hundred thirty thousand, three hundred thirteen".